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What tense to use when writing a thesis?

I am well aware of the fact that there are a number of questions that talk about tenses in research, but I still have not found exactly what I am after.

Basically my question is this, in a Master dissertation, should the tense be the same throughout the entire text? Or is it acceptable (or even required) to use different tenses in different structures?

Assuming the following structure, if you believe that there should be separate tenses, would the suggestions in brackets be correct?

• Title ( Present )
• Abstract ( Imperfect Past )
• Introduction ( Present + Future )
• Methodology ( Past Perfect, Present, Future or Mix? )
• Results ( Past Perfect )
• Discussion ( Present* )
• Conclusion ( Mix?, conditional present )

*Would the choice of any present tense put all preceding sections in a past tense?

Looking at that structure I find it hard to see that only one tense should be adopted throughout the entire text.

Sources: This , this and that .

• writing-style

• I was about to say "The correct tense for the correct sections" but I see you are already thinking in terms of sections. Good question. It might be interesting to run corpus linguistics on this to find out. –  Frames Catherine White Commented Jul 4, 2017 at 15:39
• 1 I would use the past only for discussion of prior work. –  gerrit Commented Jul 4, 2017 at 17:09
• @gerrit: In papers involving experiments, the experiments are typically described in the past tense. –  Peter Shor Commented Jul 4, 2017 at 18:51
• @PeterShor Maybe so. That makes me a minority. I don't destroy my instruments after use so when I describe them, I do so in the present tense. I might use them again! Consistency is most important, however. –  gerrit Commented Jul 4, 2017 at 18:57
• @gerrit: I can see writing "The apparatus consists of ..." , but do you mean you would also write "500 observations are taken for each value of the electric field" ? –  Peter Shor Commented Jul 4, 2017 at 19:27

The answer to this question varies across disciplines. Your dissertation presumably falls within some academic discipline. Look at other papers in the same discipline, and see what tenses they use. For example, unlike your suggestion, in math papers the abstract is usually present tense.

If some of the premier journals in your discipline have a style guide, look at these style guides and see what they say.

The journal Nature , in which the majority of articles are in the sciences, has the following suggestions for verb tense (I've left out a few of their examples):

Past tense Work done We collected blood samples from . . . Consequently, astronomers decided to rename . . . Work reported Jankowsky reported a similar growth rate . . . In 2009, Chu published an alternative method to . . . Observations The mice in Group A developed, on average, twice as much . . . The conversion rate was close to 95% . . . Present tense General truths Microbes in the human gut have a profound influence on . . . The Reynolds number provides a measure of . . . Atemporal facts This paper presents the results of . . . Section 3.1 explains the difference between . . . Behbood's 1969 paper provides a framework for . . . Future tense Perspectives In a follow-up experiment, we will study the role of . . . The influence of temperature will be the object of future research . . .

• "We collected blood samples from . . ." That's strange. I thought they want you to avoid I and We? "Blood samples were collected from..." sounds much more like a nature paper. –  user64845 Commented Jul 4, 2017 at 22:01
• @DSVA: There has been a rethinking of the tradition of never using we or I in scientific papers. While some journals still maintain this rule, many welcome use of the first person plural. Another quote from that same link: 'As a second argument against a systematic preference for the passive voice, readers sometimes need people to be mentioned. A sentence such as "The temperature is believed to be the cause for . . . " is ambiguous. Readers will want to know who believes this — the authors of the paper, or the scientific community as a whole? ' (continued ...) –  Peter Shor Commented Jul 4, 2017 at 23:55
• 'To clarify the sentence, use the active voice and set the appropriate people as the subject, in either the third or the first person, as in the examples below. Biologists believe the temperature to be . . . Keustermans et al. (1997) believe the temperature to be . . . The authors believe the temperature to be . . . We believe the temperature to be . . . ' –  Peter Shor Commented Jul 4, 2017 at 23:55
• And let me modify the Nature suggestions. I have the impression that work done and observations are usually past tense, but work reported is often present perfect tense — Jankowsky has reported a similar growth rate ... Of course, if you mention a year with work reported, then for grammatical reasons it has to be past tense. –  Peter Shor Commented Aug 27, 2017 at 20:16

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How to Use Tenses within Scientific Writing

Written by: Chloe Collier

One’s tense will vary depending on what one is trying to convey within their paper or section of their paper. For example, the tense may change between the methods section and the discussion section.

Abstract --> Past tense

• The abstract is usually in the past tense due to it showing what has already been studied.

Example: “This study was conducted at the Iyarina Field School, and within the indigenous Waorani community within Yasuni National Park region.”

Introduction --> Present tense

• Example: “ Clidemia heterophylla and Piperaceae musteum are both plants with ant domata, meaning that there is an ant mutualism which protects them from a higher level of herbivory.”

Methods --> Past tense

• In the methods section one would use past tense due to what they have done was in the past.
• It has been debated whether one should use active or passive voice. The scientific journal Nature states that one should use active voice as to convey the concepts more directly.
• Example: “In the geographic areas selected for the study, ten random focal plants were selected as points for the study.”

Results --> Past tense

• Example: “We observed that there was no significant statistical difference in herbivory on Piperaceae between the two locations, Yasuni National Park, Ecuador (01° 10’ 11, 13”S and 77° 10’ 01. 47 NW) and Iyarina Field School, Ecuador (01° 02’ 35.2” S and 77° 43’ 02. 45” W), with the one exception being that there was found to be a statistical significance in the number count within a one-meter radius of Piperaceae musteum (Piperaceae).”

Discussion --> Present tense and past tense

• Example: “Symbiotic ant mutualistic relationships within species will defend their host plant since the plant provides them with food. In the case of Melastomataceae, they have swellings at the base of their petioles that house the ants and aid to protect them from herbivores.”
• One would use past tense to summarize one’s results
• Example: “In the future to further this experiment, we would expand this project and expand our sample size in order to have a more solid base for our findings.”

• Higher Education
• Academic Writing

Verb Tenses in Academic Writing

• December 2019

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Verbs are direct, vigorous communicators. Use a chosen verb tense consistently throughout the same and adjacent paragraphs of a paper to ensure smooth expression.

Use the following verb tenses to report information in APA Style papers.

Verb tense is covered in the seventh edition APA Style manuals in the Publication Manual Section 4.12 and the Concise Guide Section 2.12

From the APA Style blog

Check your tone: Keeping it professional

When writing an APA Style paper, present ideas in a clear and straightforward manner. In this kind of scholarly writing, keep a professional tone.

The “no second-person” myth

Many writers believe the “no second-person” myth, which is that there is an APA Style guideline against using second-person pronouns such as “you” or “your.” On the contrary, you can use second-person pronouns in APA Style writing.

The “no first-person” myth

Whether expressing your own views or actions or the views or actions of yourself and fellow authors, use the pronouns “I” and “we.”

Navigating the not-so-hidden treasures of the APA Style website

This post links directly to APA Style topics of interest that users may not even know exist on the website.

Welcome, singular “they”

This blog post provides insight into how this change came about and provides a forum for questions and feedback.

Dissertations & projects: Tenses

• Research questions
• The process of reviewing
• Project management
• Literature-based projects

On this page:

“You will use a range of tenses depending on what you are writing about . ” Elizabeth M Fisher, Richard C Thompson, and Daniel Holtom,   Enjoy Writing Your Science Thesis Or Dissertation!

Tenses can be tricky to master. Even well respected journals differ in the guidance they give their authors for their use. However, their are some general conventions about what tenses are used in different parts of the report/dissertation. This page gives some advice on standard practice.

What tenses will you use?

There are exceptions however, most notably in the literature review where you will use a mixture of past , present and present perfect tenses (don't worry, that is explained below), when discussing the implications of your findings when the present tense is appropriate and in the recommendations where you are likely to use the future tense.

The tenses used as standard practice in each of these sections of your report are given and explained below.

In your abstract

You have some leeway with tense use in your abstract and guidance does vary which can sometimes be confusing. We recommend the following:

Describing the current situation and reason for your study

Mostly use the present tense,  i.e. "This is the current state of affairs and this is why this study is needed."

Occasionally, you may find the need to use something called the present perfect tense when you are describing things that happened in the past but are still relevant. The present perfect tense uses have/has and then the past participle of the verb i.e. Previous research on this topic has focused on... 

Describing the aims of your study

Here you have a choice. It is perfectly acceptable to use either the present or past tense,  i.e. "This study aims to..." or "This study aimed to..." 

Describing your methodology

Use the past tense to describe what you did, i.e. "A qualitative approach was used." "A survey was undertaken to ...". "The blood sample was analysed by..."

Describing your findings

Use the past tense to describe what you found as it is specific to your study, i.e. "The results showed that...", "The analysis indicated that..."

Suggesting the implications of your study

Use the present tense as even though your study took place in the past, your implications remain relevant in the present, i.e. Results revealed x which indicates that..."

Example abstract 

An example abstract with reasoning for the tenses chosen can be found at the bottom of this excellent blog post: 

Using the Present Tense and Past Tense When Writing an Abstract

In your methodology

The methodology is one of the easiest sections when it comes to tenses as you are explaining to your reader what you did. This is therefore almost exclusively written in the past tense.

Blood specimens were frozen at -80 o C.

A survey was designed using the Jisc Surveys tool.

Participants were purposefully selected.

The following search strategy was used to search the literature:

Very occasionally you may use the present tense if you are justifying a decision you have taken (as the justification is still valid, not just at the time you made the decision). For example: 

Purposeful sampling was used to ensure that a range of views were included. This sampling method maximises efficiency and validity as it identifies information-rich cases and ... (Morse & Niehaus, 2009).

In your discussion/conclusion

This will primarily be written in the present tense as you are generally discussing or making conclusions about the relevance of your findings at the present time. So you may write:

The findings of this research suggest that.../are potentially important because.../could open a new avenue for further research...

There will also be times when you use the past tense , especially when referring to part of your own research or previous published research research - but this is usually followed by something in the present tense to indicate the current relevance or the future tense to indicate possible future directions:

Analysis of the survey results found most respondents were not concerned with the processes, just the outcome. This suggests that managers should focus on...

These findings mirrored those of Cheung (2020), who also found that ESL pupils failed to understand some basic yet fundamental instructions. Addressing this will help ensure...

In your introduction

The introduction generally introduces what is in the rest of your document as is therefore describing the present situation and so uses the present tense :

Chapter 3  describes  the research methodology.

Depending on your discipline, your introduction may also review the literature so please also see that section below.

In your literature review

The findings of some literature may only be applicable in the specific circumstances that the research was undertaken and so need grounding to that study. Conversely, the findings of other literature may now be accepted as established knowledge. Also, you may consider the findings of older literature to be still relevant and relatively recent literature be already superseded. The tenses you write in will help to indicate a lot of this to the reader. In other words, you will use a mix of tenses in your review depending on what you are implying.

Findings only applicable in the specific circumstances

Use the past tense . For example: 

In an early study, Sharkey et al. (1991)  found  that isoprene emissions  were doubled  in leaves on sunnier sides of oak and aspen trees. 

Using the past tense indicates that you are not implying that isoprene emissions are always doubled on the sunnier side of the trees, just that is what was found in the Sharkey et al. study.

Findings that are still relevant or now established knowledge

Mostly use the present tense , unless the study is not recent and the authors are the subject of the sentence (which you should use very sparingly in a literature review) when you may need to use a mixture of the past and present. For example:

A narrowing of what 'graduateness' represents damages students’ abilities to thrive as they move through what will almost certainly be complex career pathways (Holmes, 2001).

Holmes (2001) argued strongly that a narrowing of what 'graduateness' represents damages  students’ abilities to thrive as they move through what will almost certainly be complex career pathways

Both of these imply that you think this is still the case (although it is perhaps more strongly implied in the first example). You may also want to use some academic caution too - such as writing 'may damage' rather than the more definite 'damages'.

Presenting your results

As with your methodology, your results section should be written in the past tense . This indicates that you are accepting that the results are specific to your research. Whilst they may have current implications, that part will not be considered until your discussion/conclusions section(s).

Four main themes were identified from the interview data.

There was a significant change in oxygen levels.

Like with the methodology, you will occasionally switch to present tense to write things like "Table 3.4 shows that ..." but generally, stick to the past tense.

In your recommendations

Not everyone will need to include recommendations and some may have them as part of the conclusions chapter. Recommendations are written in a mixture of the present tense and  future tense :

It is recommended that ward layout is adapted, where possible, to provide low-sensory bays for patients with autism. These will still be useable by all patients but...

Useful links

• Verb tenses in scientific manuscripts From International Science Editing
• Which Verb Tenses Should I Use in a Research Paper? Blog from WordVice
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The tense debate

Last week my friend and PhD student @tokenlefty emailed me to ask:

“When writing literature reviews, does one use past tense or present tense?  ie: Sorensen examined the potential for .. or: Sorensen examines the potential for

I wrote back:

“I prefer present tense because it implies an active conversation. Unless the author is dead, mc dead dead and everyone knows it. Even then there’s dead and Really Dead.”

Which didn’t make much sense when I read it back to myself. In my defense I was kind of busy and @tokenlefty is accustomed to getting cryptic emails from me. Then I had a thought – is this just the way I do it? Is there a ‘correct’ way to do tense that I was not aware of? As I looked into the issue, it was surprisingly complex and I decided it needed a post on its own.

The usual advice it to pick a tense and stick to it throughout your thesis. I like present tense – most of the time. For me the use of present tense implies that a scholarly conversation is going on Right Now, and that you are commenting on it (much like a cricket game). The Scholarly Conversation may have been going on for some decades – but that is still Right Now in an academic sense. Besides I have read many times that using present tense is one way to have an ‘active’ voice in your writing – which makes your thesis an easier read.

I do ‘break the rules’ and use past tense alongside present tense, usually for rhetorical purpose . For instance, like many other disciplines, the research field I work in (education) has a heritage of ideas.  I will still routinely use present tense to refer to people who ‘grandfathered’ the ideas which I am using (sorry for the gendering there, but unfortunately they are all men). I learned this from my colleague and philosopher Dr Robyn Barnacle , who argues that although people die, their ideas live on. Following this logic I  use past tense to talk about dead ideas – even if the people who wrote about them are still living. There is however the ‘dead mc dead dead’ category, which I reserve for people like Socrates and Aristotle: some of their ideas are so fundamental they have never died, but to refer to them in present tense would be, well – kind of weird.

But. Should I be recommending this approach to someone in an entirely different field to me? As the Explorations in Style blog said in a post about using resources this week, we should be careful of any kind of ‘universalizing’ advice when it comes to doing a thesis. I agree with this wholeheartedly; disciplinary context matters. As Howard Becker pointed out: we all have an ‘academic accent’ in our writing which marks us as members of a certain tribe. Learning to develop this accent is part of the reason for doing a PhD in the first place.

I still didn’t have an answer for this blog, which tries to cater to all disciplines. So I tried to get clarity by consulting with the oracles , i.e.: all my ‘go to’ texts on writing a thesis which you can see in the photo. I’m sorry to say, most of them let me down. In “Helping Doctoral students to Write” by Kamler and Thomson there is an excellent discussion on active voice and passive voice (chapter seven). This seemed, from close reading, to back up what I am saying. But again, this is written for a social science / educational audience.

Facing a dead end, I emailed my back up oracle, and fellow research education nerd , Dr Judy Maxwell at the Study and Learning Centre here at RMIT, who spends most of her days teaching scientists about grammar. Judy confirmed that the debate about which tense to use is a hot topic amongst research students and confirmed that there isn’t one authoritative text on it. She noted that there is “a general feeling among science/engineering students that the past tense is always used”.

Like me, Judy doesn’t like the use of past tense, but for a different reason. She pointed out that there’s the potential for ambiguity: does the person you’ re citing still think the same way , or has she/he moved on? Judy tells me, however, that when she presents this point of view to science/engineering researchers they don’t see it as a problem, she thinks this stems from:

“… the way the hard/technical sciences generally talk about the literature – they’re usually more interested in the actual research rather than what was found, which is generally the opposite of social sciences, where what was found, and who found it, is more important. This is probably why author/date systems such as APA and Harvard and more author-prominent citations are used in these areas, compared to Vancouver or footnotes and information-prominent citations are used in hard/physical sciences.”

Usually Judy’s answer for questions about writing style (and mine) is to refer students to journal articles and theses in their discipline. But, as Judy and I talked, we wondered if this is good advice. We don’t want to   promote replicating present practice  if the practice itself is questionable . Just like the Greeks still built stone temples like they were wood temples , we can hang onto ways of doing things long beyond their use by date: especially, I would argue, in academia.

As so often happens, I am left with more questions than answers (but you guys don’t read this blog for simplistic answers right?!). Clearly there’s the potential for choice here; maybe talking about it more will help you make a decision. So how do you ‘do tense’ in your literature review and why? Have you argued with your supervisor about it? Do you think the argument that “everyone does it this way” is a good enough reason to keep doing it that way?

Related Posts:

The Dead Hand of the thesis genre ?

The literature review – knowing when to stop

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Mastering the Use of Tenses in Your Research Paper 

Many students and early career researchers find themselves grappling with various aspects of academic writing. One critical aspect is ensuring correct grammar, most importantly the appropriate use of tenses in your research paper. In this article, we explain the basics of using tenses in scientific writing and list best practices for different sections of your academic manuscript. By understanding the role of tenses in your research paper and applying them accurately, you can enhance the clarity and credibility of our research work. 

Table of Contents

• Understanding the basics: Using tenses in research papers 
• The simple past tense: Literature review, methods 
• The past perfect tense: Methods, conclusion 
• The simple present tense: Introduction, results, tables and figures  
• The present perfect tense: Introduction, literature review 
• The future tense: Discussion, conclusions 
• How Paperpal can help you ensure correct usage of verb tenses in academic writing?  

Understanding the basics: Using tenses in research papers

Tenses in scientific writing serve as valuable tools to indicate the time frame in which certain actions or ideas take place. The simple past tense and simple present tense are the most used tenses in research papers. They are supplemented by the present perfect, past perfect, and occasionally the future tense. Consistency and precision are crucial in academic writing, so let’s into the basics of tenses in your research paper and discuss the recommended tenses for each section.

Fix language and grammar, including tense errors, in minutes with Paperpal. Try it for free!    

The simple past tense: Literature review, methods

Use this tense in your research paper when talking of or describing specific actions or events that occurred in the past; they should not be linked to the present in the same sentence. The simple past tense is used predominantly in the literature review to talk about existing research on the topic, for example, “Watson and Crick published their landmark paper on the structure of DNA in 1953.” It is also typically used in the methods section to describe the methods used in previous studies; what you did and how you did it. For example, “We selected five samples at random.” This tense in scientific writing can also be used to state facts that were once believed to be true but have since been invalidated, for example, “Bats were thought to be blind.”  

The past perfect tense: Methods, conclusion

Best used to describe two related events that occurred at different times in the past, this tense is typically used in the methods section, especially when describing earlier stages of the experimental procedure. For example, “By the time the temperature and humidity reached optimal levels, the plants had already begun to revive,” or “Respondents who had been grouped into different control groups were given a placebo instead of the new formulation.” Use the past perfect tense in your research paper to describe research or experiments that may have already been completed at the time of writing the manuscript and in the conclusion to summarize the research findings.  

The simple present tense: Introduction, results, tables and figures

A researcher or academic writer can use simple present tense in the introduction when stating the objectives of the study, to interpret the results, discuss the significance of the findings or to present conclusions. Use the simple present tense in your research papers when referring to results presented in tables and figures in your writing. For example, “Fig.3 shows that…”. The present tense an also be used to talk about the research paper as a whole, for example, “Section 4.1 discusses…”. 

This tense in scientific writing is also used to state what is generally true and what is unlikely to change. For example, “The Earth revolves around the sun” or “Human babies generally start speaking when they are 2 years old.” This tense works well in the results section , which indicates what one believes to be true and relevant to the present research. For example, “Robinson maintains that soaking seeds in strong acid helps in breaking seed dormancy.”  

Avoid inconsistent verb tenses in academic writing. Check your writing with Paperpal now!

The present perfect tense: Introduction, literature review

The present perfect tense in scientific writing is used to talk about a past event that is linked to the present or to talk about trends or events that have occurred recently. One may need to use this tense in the introduction while providing a background to the study. For example, “The demand for more sophisticated 5G devices has increased significantly over the past few years.” Additionally, the present perfect tense is also used frequently in the literature review sections while referring to previous research that is fairly recent. For example, “Recent experiments on the samples collected have revealed high levels of saline.”  

The future tense: Discussion, conclusions  

Use the future tense in your research paper when describing events that are expected to occur in the future; this is not very common in academic writing. Typically, its use is limited to the discussion section toward the end, when one needs to make recommendations or indicate a future course of action based on the research results. It is usually recommended that parts of the conclusion section be written in the future tense. For example, “These research findings will open up new possibilities for the effective use of Epsom salt in agriculture.”  

Remember that the grammar and tense guidelines provided above are not hard and fast rules, which can make it more confusing, especially for those who do not have English as their first language. Ask peers to proofread your work carefully for incorrect or mixed tenses in a single sentence or paragraph or turn to trusted AI academic writing tools like Paperpal. 

How Paperpal can help you ensure correct usage of verb tenses in academic writing?   

Academic writing demands high-quality standards; it’s essential to adhere to grammar and style conventions. This ensures conformity with institutional and field-specific standards, and clarity in communicating what was studied, when it happened, and from which perspective the research is discussed. To determine the flow and coherency of your paper, using the right verb tenses is essential.  

Here’s how Paperpal, an AI academic writing assistant, can help you maintain consistency in verb tenses so that readers can easily follow the progress of your ideas and arguments: 

• Sign Up or Log In: Start by creating an account or logging into Paperpal . 
• Paste your content: Once logged in, paste your research paper’s content onto the writing document. 
• Get language and grammar suggestions: Click on the Edit icon on the right pane. Paperpal analyzes your text to identify errors, including verb form, tense usage, spellings, punctuations, word choice, and grammar. 
• Fix errors and review: You can accept the relevant suggestions, and reject the irrelevant ones, and correct all the errors in a go.  

Researchers need to familiarize themselves with the correct use of tenses in research papers, but with Paperpal, it gets easier. Paperpal is not just a grammar and language checker. It also provides rewriting, word reduction, and academic tone checks to align your writing with academic conventions. You can even build your writing skills and learn how to avoid such errors in the future with Paperpal’s detailed writing “tips” with simple explanations for editing suggestions.    

Understanding and implementing the appropriate use of tenses in different sections of your research paper is essential for effective communication of your ideas. By mastering the use of tenses in your research paper, you can ensure clarity, consistency, and accuracy and elevate the quality of your academic writing.  

Paperpal is a comprehensive AI writing toolkit that helps students and researchers achieve 2x the writing in half the time. It leverages 21+ years of STM experience and insights from millions of research articles to provide in-depth academic writing, language editing, and submission readiness support to help you write better, faster.  

Get accurate academic translations, rewriting support, grammar checks, vocabulary suggestions, and generative AI assistance that delivers human precision at machine speed. Try for free or upgrade to Paperpal Prime starting at US$19 a month to access premium features, including consistency, plagiarism, and 30+ submission readiness checks to help you succeed.  

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How to write a PhD in a hundred steps (or more)

A workingmumscholar's journey through her phd and beyond, changing tenses as you write your dissertation.

The PhD student I am supervising sent the first draft of her methodology chapter yesterday with a series of questions and notes for me and the co-supervisor. One of them was about tense: she is writing everything in the present and future tense, but wondered if this was a mistake. It got me thinking (again) about tense in the PhD thesis , and the process of moving from future to past as the project progresses.

I have written here a little about the gap between the logic of discovery and the logic of display or dissemination in writing. As you are working, everything is either ‘I am doing this’ and ‘I will be doing that eventually’. This is pretty much the tense in which you write your proposal – proposals are forward  looking. So, as you start you research, you will naturally be thinking now, and on to the next steps, and your writing will most likely reflect this in the tenses you choose. This is the logic of discovery . As you move along, you will make decisions, close some doors, open others , and your argument will unfold and form as you do so.

So what to do now, in the midst of your research and writing – can and should you anticipate being finished and therefore writing everything in the methodology in the past tense, or do you worry about that later? It does seem like more work to write in the voice of discovery while you are still discovering things, and then write again later in the voice of dissemination as you reorganise and display your thinking with the benefit of (some) hindsight. However, I would caution against trying to anticipate too much . A significant part of doing a PhD is the process of doing a piece of research, and learning through missteps, successes and issues like the one discussed here how doing and writing about research feels and looks and sounds. That way, you can go on to do further research, either on your own or with others post-PhD, and you can eventually supervise PhD students yourself.

So my advice, if you are stuck in a similar spot to my PhD student is this: be where you are . Think and write your way through this patch, and write in whatever tense and voice feels most authentic to you at this point. The good news is that there will be time for rewriting, polishing and updating before you submit, and it’s quite a pleasant feeling to go back to this methodology chapter after the findings have been presented and analysed, and find that you can edit, sharpen and focus that section to create a tight, accurate and interesting narrative about the nuts and bolts of your PhD. As you do so, every time you do so, your researcher capacity and voice and ability to add to the conversation through the knowledge you are making grows, and that is what being an academic researcher is about.

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Present and Past Tenses Used in Research Papers

• First Online: 30 June 2022

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• Adrian Wallwork 3  

Part of the book series: English for Academic Research ((EAR))

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Below are some guidelines on the use of the three most common tenses in research papers: present simple , present perfect , past simple . These guidelines are NOT grammatical rules. The guidelines can be broken. They vary depending on the author, the discipline, and the journal.

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Wallwork, A. (2022). Present and Past Tenses Used in Research Papers. In: Essential English Grammar and Communication Strategies. English for Academic Research. Springer, Cham. https://doi.org/10.1007/978-3-030-95612-7_11

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How Can You Decide on Tense Usage in Your Dissertation?

The corpus research suggests that the most often used tenses in academic writing are the simple present, the simple past, and the present perfect. Then, what comes next is the future tense.

Which tenses are most common in academic writing?

The corpus research suggests that the most often used tenses in academic writing are the simple present tense, the simple past tense, and the present perfect tense. Then, what comes next is the future tense.

Simple present tense: You can use the simple present to define a general truth or a habitual action. This tense demonstrates that what you state is usually true in the past, present, and future.

Example:  Water generally boils at 100C.

Simple past : You may employ the simple past tense to call a completed action that occurred at a specific point in the past (e.g., last month, one hour ago, last Sunday). The specific point of time is 2019 in the following example.

Example:  The first known COVID outbreak started in Wuhan, Hubei, China, in November 2019.

Present perfect tense: The present perfect indicates an action occurring at a nonspecific time or repeatedly in the past. However, this action has a close connection with the present time. The present perfect tense may introduce background information in a paragraph, reinforcing the main idea mentioned there. Following the first sentence, switching to the simple past is possible.

Example:  Many scientists  have employed  this method.

Example:  Many researchers  have investigated  how a small firm can succeed after its poor start. They gradually learned what is essential in the market.

Future tense:  You may use the future tense to describe an action that will occur at a particular point in the future (It is imperative when writing a research, grant, or dissertation proposal).

Example:  I  will conduct  the ANOVA procedure in my study’s statistical part.

APA guidelines concerning verb tenses

In its last published guideline, APA accentuated the consistency and accuracy in tense verb usage (APA 7, Section 4.12 and Table 4.1). It suggests that you must avoid unnecessary shifts in verb tense within a paragraph or adjacent paragraphs. This avoidance helps secure smooth expression and improves readability. It would be best if you used the past tense (e.g., scientists  posed ) or the present perfect (e.g., researchers  have concluded ) for the literature review . Thus, you must present the procedure description if you discuss past events. Nonetheless, it would help if you resorted to the past tense to describe the results (for example, ANOVA results revealed that the treatment improved food's shelf-life substantially). In discussing the implications of the results and present conclusions, you must use the present tense (i.e., our results suggest that alcohol consumption increases the accident incidence rate). 

When you need to explain what an author or scientist stated or did, you must use the past tense.

Milliken (2012)  reported, revealed, stated, found that…..…

Nevertheless, you can shift to the present tense if your research findings can be generalized or held in general:

Hunt (2010)  revealed  that revising a manuscript  improves  its chance of acceptance.

Kropf (2016)  discovered  that color  is  an essential trait of fresh meat.

Which tense should I use referring to my document (thesis, dissertation, research proposal, etc.)

If you wish to preview what is ahead in your text or elaborate on what is happening at that moment in your document, you must use either the present or future tense.

In this research, I  will specify …

In this research, I  specify …

In the last chapter, I  will elaborate on …

In the last chapter, I  elaborate on …

You can also refer back to already presented information, such as a synopsis of discussions that have already occurred or conclusions to your chapters or sections. Then, the tense you have to use is the past tense:

Chapter 1  contained  the literature review.

In closing, in this section, I  posed  information on…

Should I use simple past tense or present perfect tense?

British and American English have slightly varying rules for using the present perfect tense. Scientists have also reported that individual preferences may dictate the usage of the simple past or the present perfect tense in American English. Put differently, an American English writer may opt for the simple past on specific occasions, whereas another American English writer may prefer the present perfect without apparent reasons.

However, you must note that the simple past tense denotes a completed action. Therefore, it usually employs signal words or phrases, including "yesterday," "last year," "a week ago," or "in 2020," to designate the specific time in the past when the action occurred.

I  went  to Greece  in 2011 .

He  finished  the team member performance report  last week .

The present perfect concentrates more on the action without accentuating the specific time it occurred. Note that the action has occurred even though the specific time is unavailable.

I  have seen this movie three times .

The present perfect also concentrates more on the result of the action.

He  has finished  reviewing the manuscript.

You should be able to understand the usage of the present perfect with some signal words such as "since," "already," "just," "until now," "(not) yet," "so far," "ever," "lately," or "recently."

I  have  already  finished  the book on the Turkish economy.

Researchers  have used  this term  since  it was coined. 

He has recently defended his Ph.D. dissertation.

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Our pricing is based on the type of service you avail of here, be it editing or proofreading. We charge on the basis of the word count of your manuscript that you submit for editing and proofreading and the turnaround time it takes to get it done. If you want to get an instant price quote for your project, copy and paste your document or enter your word count into our  pricing calculator.

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This article explains how can you dictate on tense usage in a dissertation or thesis. To give you an opportunity to practice proofreading, we have left a few spelling, punctuation, or grammatical errors in the text. See if you can spot them! If you spot the errors correctly, you will be entitled to a 10% discount.

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Verb Tenses to Use in a Research Paper

Why Using the Correct Verb Tense is Important

When writing an academic paper, writers should follow the accepted grammar and style conventions: not only to abide by the institutional and domain standards, but to communicate clearly to readers what was studied, when it took place, and from what perspective you are discussing your research (and that of others) in your paper. One crucial writing element that you must consider when composing your paper is  verb tense . Which tense you use will determine the flow and coherency of your paper.

You might have found yourself thinking along these lines: “Everything in this study has already been completed, so shouldn’t I simply write everything in the simple past tense?”

The answer is no–at least not in a strict sense. The verb tense you use for a given sentence or phrase depends on your position as the author to the material you are discussing. As the author, you look at each element mentioned in your text from a distance in terms of your role: as a participant, critic, or messenger, among others. You must also take into account the chronological reasons for choosing between present and past tenses in a given instance.

Knowing which tense to use requires both knowledge of the exact guidelines set out for you in whichever formatting style you are following ( APA , AMA , etc.), as well as some discretion and savvy in choosing the tense that makes the most sense for a given statement in the paper.

While new authors should certainly familiarize themselves with the specific guidelines of the formatting style they are applying, this article will focus on the  most common rules of verb tense applied to research papers in journals and at academic institutions, reflecting basic verb usage rules in academic English and encompassing  all  formatting styles.

Bear in mind that these grammar and verb-tense issues will largely be corrected by any competent proofreading service or research paper editing service , and thus professional revision of all academic documents is recommended before submission to journals or conferences.

Rules for Present, Past, and Perfect Tense Verbs

First, there are three basic verb tenses used in research papers:  present  (simple present),  simple   past , and  present perfect . We will talk about how research paper sections determine verb tense in a minute, but first, let’s review when each tense should be used in general throughout the paper.

PRESENT TENSE VERBS

The present tense is used to talk about general facts, discuss current meanings and implications, and suggest future applications .

General facts are constant and do not change throughout time (the ultimate evolution of scientific progress notwithstanding). Always use the present when discussing general scientific facts.

Example: “Insulin and glucagon regulates blood glucose levels.” 

Implications are closely related to general facts and thus the same rule is applied.

Example: “An elevated glucose level indicates a lack of glucagon hormones in the pancreas.”

Further research is called for or stressed as important through a phrase in the present tense.

Example: “Further studies about glucagon receptors are needed.”

SIMPLE PAST TENSE VERBS

The simple past is generally used to discuss events that have been c ompleted in the past at some distinct time and/or place . It is most often applied to discrete events such as studies, experiments, or observed phenomena.

Example: “Scientists in Wales discovered a new enzyme in the liver.” Example: “Protocol X was used to analyze the data.”

PRESENT PERFECT TENSE VERBS

The present perfect tense (or simply “perfect tense”) is used in research papers to refer to  events or actions that have taken place at some unidentified time in the past or have started but are still ongoing or only recently completed . It often establishes a general background in the Introduction section , adding a backdrop on which you can explain the motivations for and purpose of your study.

Note that it is the least frequently used tense in most research papers and should not be over-employed–focus more on detailed actions by using the simple past.

Example:  “Many studies have focused on glucagon as an important regulating hormone.” Example:  “Until recently, researchers have analyzed this kind of data using Chi-Square Statistics.” Example:  “Efforts have been made to understand more about this process.”  (passive)

Appropriate Verb Tenses by Research Paper Section

It bears repeating that the “best” tense to use is the one that is recommended (or demanded) by whichever formatting manual you are using. However, there is a high degree of continuity between the common styles, and the following rules for usage in each section will likely apply to your research paper no matter where it will be published.

Abstract verb tenses

In general, use the simple past for the abstract of your manuscript; for a concise introductory sentence, use the present perfect. To establish a need for your study—–for instance, by explaining the current circumstances of the world or the specific area in which you are working—–you can also use the present tense.

Example of introductory sentence (present perfect): “Recent studies of glucagon and insulin production have led to breakthroughs in medicine.” Example of establishing background/circumstances/purpose (present): “Diabetes  accounts for a higher number of deaths in the US than previously calculated.”

For general statements and facts, the paper itself, or analysis of findings, use the present tense.

Example of a statement of fact: “In the US, diabetes is the most common endocrine disease.”

If you are stating a fact or finding from an earlier specified time or place, use the simple past:

Example: “In 2016, diabetes was the most common endocrine disease.” Have a look at our more in-depth instruction to writing an abstract for a research paper or at these do’s and don’ts of abstract writing if you need additional input.

Introduction section verb tenses

Use a mixture of present and past tense in the introduction section .

The present tense is applied when discussing something that is always true; the simple past tense is used for earlier research efforts, either your own or those reported by another group.

Example of earlier research efforts (simple past): “This same research team discovered a similar enzyme in their 2012 study.”

If the time or location of the demonstration is unknown or not important, use the present perfect.

Example: “Prior research has indicated a correlation between X and Y.”

For the concluding statements of your introduction, use the simple past or present perfect.

Example of concluding statement (simple past): “The CalTech glucagon studies were inconclusive.” Example of concluding statement (present perfect): “Prior research in this area has been inconclusive.”

Use the past perfect when you talk about something that happened or was found to be the case in the past, but which has since been revised. Example of revised information (past perfect): “The Dublonsky study had determined that X was Y, but a 2012 study found this to be incorrect.”

Literature review verb tenses

Knowing which tenses to use for a literature review (either as part of a research paper or as a stand-alone article) can be a bit tricky, as your usage depends both on which style manual you are using (APA, AMA, MLA , or others) and on how you are discussing the literature.

The simple past is usually applied when using the researcher’s name as the subject of the sentence and discussing the methods or results of that study itself

Example of describing researcher’s actions: “Pearson (1997) discovered a new enzyme using similar methods.”

Other verbs commonly found in this usage context: investigated, compared, studied, analyzed, investigated, found, confirmed, performed, etc.

When giving your opinion on another researcher’s work or bringing up the results, discussion, and conclusions they make in their work, use the present tense.

Example of discussing another’s work: “Ryuku (2005) concludes that there are no additional enzymes present in the liver, a finding this current study directly refutes.” Other verbs commonly found in this usage context: stresses, advocates, remarks, argues, claims, posits. etc.

Methods section verb tenses

The Methods section fairly clearly delineates between sections written in past and those written in present tense.

Use the simple past tense to talk about what you did. (Note that you will generally find the passive voice used when describing the actions of the researchers. This puts more focus on the actions being completed and less on the agents completing the action. Passive voice has become the general standard for research papers in recent decades, but it is okay to mix passive and active voice in order to make your paper clearer and more readable.)

Example of methods of study: “A glucose molecule was added to the mixture to see how the peptide would respond.” Example of methods of analysis: “The results were analyzed using Bayesian inference.”

Use the present tense to refer to or explain diagrams, figures, tables, and charts.

Example: “Table 5 shows the results of this first isolated test.” Example: “The results of this first isolated test are displayed in Table 5.”

Results section verb tenses

The verb tense rules for the Results section are quite similar to those applied to the Methods section.

Use the past tense to discuss actual results.

Example: “The addition of 0.02 μg of glycogen activated receptor cells.” Example: “Receptor cells were activated by the addition of 0.02 μg of glycogen.”

Use the simple present tense to explain diagrams/figures/tables. Again, sentences may use both the active and passive voice.

Discussion section verb tenses

The Discussion section consists of an analysis of the findings and a kind of translation of the meanings and implications of these findings.

Use the simple past to summarize your own findings.

Example of summarizing own findings: “The experiment yielded a number of results associated with the processing of glucose.”

Use the present tense to interpret and discuss the significance of your findings.

Example: “[This study confirms that] synthetic glucagon is two-thirds as effective at decreasing fatty acid synthesis.”

Conclusions and further work

The conclusion and call for further work to be done are either provided in the last sentence or two of your paper or in a separate (but short) section at the end of the main text (check the target journal’s author instructions to be sure you follow the journal style) and summarize or emphasize the new insights your work offers.

Use the present perfect tense to clarify that your statements still hold true at the time of reading.

Example: “Results from this study have led to a deeper understanding about how different peptides interact in this enzyme.”

Use the present tense to apply findings, state implications, and suggest further research.

Example of wider implications: “This study confirms that endogenous glucagon is even more essential in metabolism than previously thought.”

When discussing further research that is either needed or intended to be carried out, the future or present tense (or subjunctive mood) can also be used, in addition to the present tense passive voice.

Example of call for future research: “Further clinical studies are needed/will be needed/must be carried out/should be carried out to isolate the cause of this reaction.”

Follow these general rules about tenses and your paper will be clearer, more chronologically correct, and generally easier to read—meaning the important implications of your study will be more easily understood. You can always go back and edit verb tenses—the more you practice, and the more papers you read, the easier it will be to identify which tense should be used for which kind of information.

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Visual: Walden logo at bottom of screen along with notepad and pencil background.

Audio: Guitar music.

Visual: The video’s title is displayed on a background image of books on a table. The screen opens to the following slide: Verb Tense Consistency in a Sentence

Within a Sentence:

• There are times verb tense should be the same
• There are times verb tense will change

Bakke (2015) conducted the interviews and then transcribed them. (Both past tense)

Herrington (2014) found that the survey participants drink an average of 2.2 cups of coffee per day. (Past and present tenses)

The researchers explained that identifying a cause will be difficult. (Past and future tenses)

Audio: So, regarding verb tense, kind of the one error that we sometimes see is errors in consistency throughout a sentence. So, there are times when the verb tense needs to be the same throughout a sentence and there are times that it will change throughout the sentence.

So, we can take a look at these examples: “Bakke conducted the interviews and then transcribed them.” So, it’s talking about two things that Bakke did. Both of these actions belong to the author or they’re something the author did. So, it makes sense for them to be consistent, that they’re both in the past tense.

In the next two examples, we see a shift in verb tense. So, “Herrington found,” past tense “that the survey participants drink,” present tense, “an average of 2.2 cups of coffee per day.” And, “The researchers explained,” past tense, “that identifying a cause will be,” future tense, “difficult.”

Visual : The word “that” is circled in the last two example sentences:

Audio: So, one characteristic of these last two sentences is that they use the word "that." So, in this sentence structure, the word “that” introduces a noun clause. And, that's not a term that you need to remember, but that's what it's called. These noun clauses are often used to report what other people think or have said. Such as when, you know, maybe you’re introducing a paraphrase or a summary or a quote. So, when you’re introducing what a researcher said or did, in this sentence structure, you may need to shift the verb tense to explain what they found or, or future action.

Visual: The following example is added to the slide:

The researcher said identifying a cause will be difficult.

Audio: One thing to note is that sometimes in English the word “that” is left out of the sentence, especially in spoken language. So, a person might say, “The researcher said identifying a cause will be difficult.” So, just keep in mind it's sometimes okay to drop the “that” from the sentence. So, just looking for the word "that" might not be an effective strategy. When deciding if you should shift the tense in the sentence, try to think about whether the sentence includes a report about what a researcher or another person said or did and that might help you decide.

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• Knowledge Base
• Verb Tenses in Academic Writing | Rules, Differences & Examples

Verb Tenses in Academic Writing | Rules, Differences & Examples

Published on 20 October 2022 by Shane Bryson . Revised on 11 September 2023.

Tense communicates an event’s location in time. The different tenses are identified by their associated verb forms. There are three main verb tenses: past ,  present , and  future .

In English, each of these tenses can take four main aspects:  simple ,  perfect ,  continuous  (also known as  progressive ), and  perfect continuous . The perfect aspect is formed using the verb  to have , while the continuous aspect is formed using the verb  to be .

In academic writing , the most commonly used tenses are the  present simple , the  past simple , and the  present perfect .

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Table of contents

Tenses and their functions, when to use the present simple, when to use the past simple, when to use the present perfect, when to use other tenses.

The table below gives an overview of some of the basic functions of tenses and aspects. Tenses locate an event in time, while aspects communicate durations and relationships between events that happen at different times.

It can be difficult to pick the right verb tenses and use them consistently. If you struggle with verb tenses in your thesis or dissertation , you could consider using a thesis proofreading service .

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The present simple is the most commonly used tense in academic writing, so if in doubt, this should be your default choice of tense. There are two main situations where you always need to use the present tense.

Describing facts, generalisations, and explanations

Facts that are always true do not need to be located in a specific time, so they are stated in the present simple. You might state these types of facts when giving background information in your introduction .

• The Eiffel tower  is in Paris.
• Light  travels faster than sound.

Similarly, theories and generalisations based on facts are expressed in the present simple.

• Average income differs by race and gender.
• Older people express less concern about the environment than younger people.

Explanations of terms, theories, and ideas should also be written in the present simple.

• Photosynthesis  refers to  the process by which plants  convert sunlight into chemical energy.
• According to Piketty (2013), inequality grows over time in capitalist economies.

Describing the content of a text

Things that happen within the space of a text should be treated similarly to facts and generalisations.

This applies to fictional narratives in books, films, plays, etc. Use the present simple to describe the events or actions that are your main focus; other tenses can be used to mark different times within the text itself.

• In the first novel, Harry learns he is a wizard and travels  to Hogwarts for the first time, finally escaping the constraints of the family that raised him.

The events in the first part of the sentence are the writer’s main focus, so they are described in the present tense. The second part uses the past tense to add extra information about something that happened prior to those events within the book.

When discussing and analyzing nonfiction, similarly, use the present simple to describe what the author does within the pages of the text ( argues , explains , demonstrates , etc).

• In The History of Sexuality , Foucault asserts that sexual identity is a modern invention.
• Paglia (1993) critiques Foucault’s theory.

This rule also applies when you are describing what you do in your own text. When summarising the research in your abstract , describing your objectives, or giving an overview of the  dissertation structure in your introduction, the present simple is the best choice of tense.

• This research  aims to synthesise the two theories.
• Chapter 3 explains  the methodology and discusses ethical issues.
• The paper  concludes with recommendations for further research.

The past simple should be used to describe completed actions and events, including steps in the research process and historical background information.

Reporting research steps

Whether you are referring to your own research or someone else’s, use the past simple to report specific steps in the research process that have been completed.

• Olden (2017) recruited 17 participants for the study.
• We transcribed and coded the interviews before analyzing the results.

The past simple is also the most appropriate choice for reporting the results of your research.

• All of the focus group participants agreed  that the new version  was an improvement.
• We  found a positive correlation between the variables, but it  was not as strong as we  hypothesised .

Describing historical events

Background information about events that took place in the past should also be described in the past simple tense.

• James Joyce  pioneered the modernist use of stream of consciousness.
• Donald Trump’s election in 2016  contradicted the predictions of commentators.

The present perfect is used mainly to describe past research that took place over an unspecified time period. You can also use it to create a connection between the findings of past research and your own work.

Summarising previous work

When summarising a whole body of research or describing the history of an ongoing debate, use the present perfect.

• Many researchers  have investigated the effects of poverty on health.
• Studies  have shown a link between cancer and red meat consumption.
• Identity politics has been a topic of heated debate since the 1960s.
• The problem of free will  has vexed philosophers for centuries.

Similarly, when mentioning research that took place over an unspecified time period in the past (as opposed to a specific step or outcome of that research), use the present perfect instead of the past tense.

• Green et al.  have conducted extensive research on the ecological effects of wolf reintroduction.

Emphasising the present relevance of previous work

When describing the outcomes of past research with verbs like fi nd ,  discover or demonstrate , you can use either the past simple or the present perfect.

The present perfect is a good choice to emphasise the continuing relevance of a piece of research and its consequences for your own work. It implies that the current research will build on, follow from, or respond to what previous researchers have done.

• Smith (2015) has found that younger drivers are involved in more traffic accidents than older drivers, but more research is required to make effective policy recommendations.
• As Monbiot (2013)  has shown , ecological change is closely linked to social and political processes.

Note, however, that the facts and generalisations that emerge from past research are reported in the present simple.

While the above are the most commonly used tenses in academic writing, there are many cases where you’ll use other tenses to make distinctions between times.

Future simple

The future simple is used for making predictions or stating intentions. You can use it in a research proposal  to describe what you intend to do.

It is also sometimes used for making predictions and stating hypotheses . Take care, though, to avoid making statements about the future that imply a high level of certainty. It’s often a better choice to use other verbs like  expect ,  predict,  and  assume to make more cautious statements.

• There  will be a strong positive correlation.
• We  expect  to find a strong positive correlation.
• H1  predicts a strong positive correlation.

Similarly, when discussing the future implications of your research, rather than making statements with will,  try to use other verbs or modal verbs that imply possibility ( can ,  could ,  may ,  might ).

• These findings  will influence  future approaches to the topic.
• These findings  could influence future approaches to the topic.

Present, past, and future continuous

The continuous aspect is not commonly used in academic writing. It tends to convey an informal tone, and in most cases, the present simple or present perfect is a better choice.

• Some scholars are suggesting that mainstream economic paradigms are no longer adequate.
• Some scholars suggest   that mainstream economic paradigms are no longer adequate.
• Some scholars have suggested   that mainstream economic paradigms are no longer adequate.

However, in certain types of academic writing, such as literary and historical studies, the continuous aspect might be used in narrative descriptions or accounts of past events. It is often useful for positioning events in relation to one another.

• While Harry is traveling to Hogwarts for the first time, he meets many of the characters who will become central to the narrative.
• The country was still recovering from the recession when Donald Trump was elected.

Past perfect

Similarly, the past perfect is not commonly used, except in disciplines that require making fine distinctions between different points in the past or different points in a narrative’s plot.

Sources for this article

We strongly encourage students to use sources in their work. You can cite our article (APA Style) or take a deep dive into the articles below.

Bryson, S. (2023, September 11). Verb Tenses in Academic Writing | Rules, Differences & Examples. Scribbr. Retrieved 22 September 2024, from https://www.scribbr.co.uk/english-language/verb-tenses/

Aarts, B. (2011).  Oxford modern English grammar . Oxford University Press.

Butterfield, J. (Ed.). (2015).  Fowler’s dictionary of modern English usage  (4th ed.). Oxford University Press.

Garner, B. A. (2016).  Garner’s modern English usage (4th ed.). Oxford University Press.

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Shane finished his master's degree in English literature in 2013 and has been working as a writing tutor and editor since 2009. He began proofreading and editing essays with Scribbr in early summer, 2014.

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Verb Tense Consistency

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Throughout this document, example sentences with nonstandard or inconsistent usage have verbs in red .

Controlling shifts in verb tense

Writing often involves telling stories. Sometimes we narrate a story as our main purpose in writing; sometimes we include brief anecdotes or hypothetical scenarios as illustrations or reference points in an essay.

Even an essay that does not explicitly tell a story involves implied time frames for the actions discussed and states described. Changes in verb tense help readers understand the temporal relationships among various narrated events. But unnecessary or inconsistent shifts in tense can cause confusion.

Generally, writers maintain one tense for the main discourse and indicate changes in time frame by changing tense relative to that primary tense, which is usually either simple past or simple present. Even apparently non-narrative writing should employ verb tenses consistently and clearly.

General guideline: Do not shift from one tense to another if the time frame for each action or state is the same.

Explains is present tense, referring to a current state; asked is past, but should be present ( ask ) because the students are currently continuing to ask questions during the lecture period.

CORRECTED: The instructor explains the diagram to students who ask questions during the lecture.

Darkened and sprang up are past tense verbs; announces is present but should be past ( announced ) to maintain consistency within the time frame.

CORRECTED: About noon the sky darkened , a breeze sprang up , and a low rumble announced the approaching storm.

Walk is present tense but should be past to maintain consistency within the time frame ( yesterday ); rode is past, referring to an action completed before the current time frame.

CORRECTED: Yesterday we walked to school but later rode the bus home.

General guideline: Do shift tense to indicate a change in time frame from one action or state to another.

Love is present tense, referring to a current state (they still love it now;) built is past, referring to an action completed before the current time frame (they are not still building it.)

Began is past tense, referring to an action completed before the current time frame; had reached is past perfect, referring to action from a time frame before that of another past event (the action of reaching was completed before the action of beginning.)

Are installing is present progressive, referring to an ongoing action in the current time frame (the workers are still installing, and have not finished;) will need is future, referring to action expected to begin after the current time frame (the concert will start in the future, and that's when it will need amplification.)

Controlling shifts in a paragraph or essay

General guideline: Establish a primary tense for the main discourse, and use occasional shifts to other tenses to indicate changes in time frame.

• Rely on past tense to narrate events and to refer to an author or an author's ideas as historical entities (biographical information about a historical figure or narration of developments in an author's ideas over time).
• Use present tense to state facts, to refer to perpetual or habitual actions, and to discuss your own ideas or those expressed by an author in a particular work. Also use present tense to describe action in a literary work, movie, or other fictional narrative. Occasionally, for dramatic effect, you may wish to narrate an event in present tense as though it were happening now. If you do, use present tense consistently throughout the narrative, making shifts only where appropriate.
• Future action may be expressed in a variety of ways, including the use of will, shall, is going to, are about to, tomorrow and other adverbs of time, and a wide range of contextual cues.

Using other tenses in conjunction with simple tenses

It is not always easy (or especially helpful) to try to distinguish perfect and/or progressive tenses from simple ones in isolation, for example, the difference between simple past progressive ("She was eating an apple") and present perfect progressive ("She has been eating an apple"). Distinguishing these sentences in isolation is possible, but the differences between them make clear sense only in the context of other sentences since the time-distinctions suggested by different tenses are relative to the time frame implied by the verb tenses in surrounding sentences or clauses.

Example 1: Simple past narration with perfect and progressive elements

On the day in question...

By the time Tom noticed the doorbell, it had already rung three times. As usual, he had been listening to loud music on his stereo. He turned the stereo down and stood up to answer the door. An old man was standing on the steps. The man began to speak slowly, asking for directions.

In this example, the progressive verbs had been listening and was standing suggest action underway at the time some other action took place. The stereo-listening was underway when the doorbell rang. The standing on the steps was underway when the door was opened. The past perfect progressive verb had been listening suggests action that began in the time frame prior to the main narrative time frame and that was still underway as another action began.

If the primary narration is in the present tense, then the present progressive or present perfect progressive is used to indicate action that is or has been underway as some other action begins. This narrative style might be used to describe a scene from a novel, movie, or play, since action in fictional narratives is conventionally treated as always present. For example, we refer to the scene in Hamlet in which the prince first speaks (present) to the ghost of his dead father or the final scene in Spike Lee's Do the Right Thing , which takes place (present) the day after Mookie has smashed (present perfect) the pizzeria window. If the example narrative above were a scene in a play, movie, or novel, it might appear as follows.

Example 2: Simple present narration with perfect and progressive elements

In this scene...

By the time Tom notices the doorbell, it has already rung three times. As usual, he has been listening to loud music on his stereo. He turns the stereo down and stands up to answer the door. An old man is standing on the steps. The man begins to speak slowly, asking for directions.

In this example as in the first one, the progressive verbs has been listening and is standing indicate action underway as some other action takes place. The present perfect progressive verb has been listening suggests action that began in the time frame prior to the main narrative time frame and that is still underway as another action begins. The remaining tense relationships parallel those in the first example.

In all of these cases, the progressive or -ing part of the verb merely indicates ongoing action, that is, action underway as another action occurs. The general comments about tense relationships apply to simple and perfect tenses, regardless of whether there is a progressive element involved.

It is possible to imagine a narrative based on a future time frame as well, for example, the predictions of a psychic or futurist. If the example narrative above were spoken by a psychic, it might appear as follows.

Example 3: Simple future narration with perfect and progressive elements

Sometime in the future...

By the time Tom notices the doorbell, it will have already rung three times. As usual, he will have been listening to loud music on his stereo. He will turn the stereo down and will stand up to answer the door. An old man will be standing on the steps. The man will begin to speak slowly, asking for directions.

In this example as in the first two, the progressive verbs will have been listening and will be standing indicate ongoing action. The future perfect progressive verb will have been listening suggests action that will begin in the time frame prior to the main narrative time frame and that will still be underway when another action begins. The verb notices here is in present-tense form, but the rest of the sentence and the full context of the narrative cue us to understand that it refers to future time. The remaining tense relationships parallel those in the first two examples.

General guidelines for use of perfect tenses

In general the use of perfect tenses is determined by their relationship to the tense of the primary narration. If the primary narration is in simple past, then action initiated before the time frame of the primary narration is described in past perfect. If the primary narration is in simple present, then action initiated before the time frame of the primary narration is described in present perfect. If the primary narration is in simple future, then action initiated before the time frame of the primary narration is described in future perfect.

Past primary narration corresponds to Past Perfect ( had + past participle) for earlier time frames

Present primary narration corresponds to Present Perfect ( has or have + past participle) for earlier time frames

Future primary narration corresponds to Future Perfect ( will have + past participle) for earlier time frames

The present perfect is also used to narrate action that began in real life in the past but is not completed, that is, may continue or may be repeated in the present or future. For example: "I have run in four marathons" (implication: "so far... I may run in others"). This usage is distinct from the simple past, which is used for action that was completed in the past without possible continuation or repetition in the present or future. For example: "Before injuring my leg, I ran in four marathons" (implication: "My injury prevents me from running in any more marathons").

Time-orienting words and phrases like before, after, by the time , and others—when used to relate two or more actions in time—can be good indicators of the need for a perfect-tense verb in a sentence.

• By the time the senator finished (past) his speech, the audience had lost (past perfect) interest.
• By the time the senator finishes (present: habitual action) his speech, the audience has lost (present perfect) interest.
• By the time the senator finishes (present: suggesting future time) his speech, the audience will have lost (future perfect) interest.
• After everyone had finished (past perfect) the main course, we offered (past) our guests dessert.
• After everyone has finished (present perfect) the main course, we offer (present: habitual action) our guests dessert.
• After everyone has finished (present perfect) the main course, we will offer (future: specific one-time action) our guests dessert.
• Long before the sun rose (past), the birds had arrived (past perfect) at the feeder.
• Long before the sun rises (present: habitual action), the birds have arrived (present perfect) at the feeder.
• Long before the sun rises (present: suggesting future time), the birds will have arrived (future perfect) at the feeder.

Sample paragraphs

The main tense in this first sample is past. Tense shifts are inappropriate and are indicated in bold .

(adapted from a narrative)

Inappropriate shifts from past to present, such as those that appear in the above paragraph, are sometimes hard to resist. The writer becomes drawn into the narrative and begins to relive the event as an ongoing experience. The inconsistency should be avoided, however. In the sample, will should be would , and rise should be rose .

The main tense in this second sample is present. Tense shifts—all appropriate—are indicated in bold.

(adapted from an article in the magazine Wilderness )

This writer uses the present tense to describe the appearance of a dragonfly on a particular July morning. However, both past and future tenses are called for when she refers to its previous actions and to its predictable activity in the future.

Click here for exercises on verb tense.

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• Dissertation

How to Write a Thesis or Dissertation Introduction

Published on September 7, 2022 by Tegan George and Shona McCombes. Revised on November 21, 2023.

The introduction is the first section of your thesis or dissertation , appearing right after the table of contents . Your introduction draws your reader in, setting the stage for your research with a clear focus, purpose, and direction on a relevant topic .

Your introduction should include:

• Your topic, in context: what does your reader need to know to understand your thesis dissertation?
• Your focus and scope: what specific aspect of the topic will you address?
• The relevance of your research: how does your work fit into existing studies on your topic?
• Your questions and objectives: what does your research aim to find out, and how?
• An overview of your structure: what does each section contribute to the overall aim?

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Table of contents

How to start your introduction, topic and context, focus and scope, relevance and importance, questions and objectives, overview of the structure, thesis introduction example, introduction checklist, other interesting articles, frequently asked questions about introductions.

Although your introduction kicks off your dissertation, it doesn’t have to be the first thing you write — in fact, it’s often one of the very last parts to be completed (just before your abstract ).

It’s a good idea to write a rough draft of your introduction as you begin your research, to help guide you. If you wrote a research proposal , consider using this as a template, as it contains many of the same elements. However, be sure to revise your introduction throughout the writing process, making sure it matches the content of your ensuing sections.

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Begin by introducing your dissertation topic and giving any necessary background information. It’s important to contextualize your research and generate interest. Aim to show why your topic is timely or important. You may want to mention a relevant news item, academic debate, or practical problem.

After a brief introduction to your general area of interest, narrow your focus and define the scope of your research.

You can narrow this down in many ways, such as by:

• Geographical area
• Time period
• Demographics or communities
• Themes or aspects of the topic

It’s essential to share your motivation for doing this research, as well as how it relates to existing work on your topic. Further, you should also mention what new insights you expect it will contribute.

Start by giving a brief overview of the current state of research. You should definitely cite the most relevant literature, but remember that you will conduct a more in-depth survey of relevant sources in the literature review section, so there’s no need to go too in-depth in the introduction.

Depending on your field, the importance of your research might focus on its practical application (e.g., in policy or management) or on advancing scholarly understanding of the topic (e.g., by developing theories or adding new empirical data). In many cases, it will do both.

Ultimately, your introduction should explain how your thesis or dissertation:

• Helps solve a practical or theoretical problem
• Addresses a gap in the literature
• Builds on existing research
• Proposes a new understanding of your topic

Perhaps the most important part of your introduction is your questions and objectives, as it sets up the expectations for the rest of your thesis or dissertation. How you formulate your research questions and research objectives will depend on your discipline, topic, and focus, but you should always clearly state the central aim of your research.

If your research aims to test hypotheses , you can formulate them here. Your introduction is also a good place for a conceptual framework that suggests relationships between variables .

• Conduct surveys to collect data on students’ levels of knowledge, understanding, and positive/negative perceptions of government policy.
• Determine whether attitudes to climate policy are associated with variables such as age, gender, region, and social class.
• Conduct interviews to gain qualitative insights into students’ perspectives and actions in relation to climate policy.

To help guide your reader, end your introduction with an outline  of the structure of the thesis or dissertation to follow. Share a brief summary of each chapter, clearly showing how each contributes to your central aims. However, be careful to keep this overview concise: 1-2 sentences should be enough.

I. Introduction

Human language consists of a set of vowels and consonants which are combined to form words. During the speech production process, thoughts are converted into spoken utterances to convey a message. The appropriate words and their meanings are selected in the mental lexicon (Dell & Burger, 1997). This pre-verbal message is then grammatically coded, during which a syntactic representation of the utterance is built.

Speech, language, and voice disorders affect the vocal cords, nerves, muscles, and brain structures, which result in a distorted language reception or speech production (Sataloff & Hawkshaw, 2014). The symptoms vary from adding superfluous words and taking pauses to hoarseness of the voice, depending on the type of disorder (Dodd, 2005). However, distortions of the speech may also occur as a result of a disease that seems unrelated to speech, such as multiple sclerosis or chronic obstructive pulmonary disease.

This study aims to determine which acoustic parameters are suitable for the automatic detection of exacerbations in patients suffering from chronic obstructive pulmonary disease (COPD) by investigating which aspects of speech differ between COPD patients and healthy speakers and which aspects differ between COPD patients in exacerbation and stable COPD patients.

Checklist: Introduction

I have introduced my research topic in an engaging way.

I have provided necessary context to help the reader understand my topic.

I have clearly specified the focus of my research.

I have shown the relevance and importance of the dissertation topic .

I have clearly stated the problem or question that my research addresses.

I have outlined the specific objectives of the research .

I have provided an overview of the dissertation’s structure .

You've written a strong introduction for your thesis or dissertation. Use the other checklists to continue improving your dissertation.

If you want to know more about AI for academic writing, AI tools, or research bias, make sure to check out some of our other articles with explanations and examples or go directly to our tools!

Research bias

• Survivorship bias
• Self-serving bias
• Availability heuristic
• Halo effect
• Hindsight bias
• Deep learning
• Generative AI
• Machine learning
• Reinforcement learning
• Supervised vs. unsupervised learning

 (AI) Tools

• Grammar Checker
• Paraphrasing Tool
• Text Summarizer
• AI Detector
• Plagiarism Checker
• Citation Generator

The introduction of a research paper includes several key elements:

• A hook to catch the reader’s interest
• Relevant background on the topic
• Details of your research problem

and your problem statement

• A thesis statement or research question
• Sometimes an overview of the paper

Don’t feel that you have to write the introduction first. The introduction is often one of the last parts of the research paper you’ll write, along with the conclusion.

This is because it can be easier to introduce your paper once you’ve already written the body ; you may not have the clearest idea of your arguments until you’ve written them, and things can change during the writing process .

Research objectives describe what you intend your research project to accomplish.

They summarize the approach and purpose of the project and help to focus your research.

Your objectives should appear in the introduction of your research paper , at the end of your problem statement .

Scope of research is determined at the beginning of your research process , prior to the data collection stage. Sometimes called “scope of study,” your scope delineates what will and will not be covered in your project. It helps you focus your work and your time, ensuring that you’ll be able to achieve your goals and outcomes.

Defining a scope can be very useful in any research project, from a research proposal to a thesis or dissertation . A scope is needed for all types of research: quantitative , qualitative , and mixed methods .

To define your scope of research, consider the following:

• Budget constraints or any specifics of grant funding
• Your proposed timeline and duration
• Specifics about your population of study, your proposed sample size , and the research methodology you’ll pursue
• Any inclusion and exclusion criteria
• Any anticipated control , extraneous , or confounding variables that could bias your research if not accounted for properly.

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George, T. & McCombes, S. (2023, November 21). How to Write a Thesis or Dissertation Introduction. Scribbr. Retrieved September 18, 2024, from https://www.scribbr.com/dissertation/introduction-structure/

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