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Key Takeaways
- Modal verbs such as can, could, may, might, must, should, and will help academic writers express degrees of certainty, necessity, and possibility with precision.
- Matching the strength of a modal verb to the strength of the underlying evidence keeps claims credible and defensible during peer review.
- Overusing high-certainty modals like will and must can make findings sound overstated, while excessive hedging with might or could can weaken an argument.
Contents
- Glossary of Key Terms
- What Are Modal Verbs in Academic Writing?
- Why Modal Verbs Matter in Academic Writing
- Types of Modal Verbs Used in Academic Writing
- Modal Verbs and Tone: Balancing Confidence and Caution
- Common Modal Verbs and Their Academic Functions
- Examples of Modal Verbs in Academic Sentences
- Common Mistakes with Modal Verbs in Academic Writing
- Tips for Using Modal Verbs Effectively
- Modal Verbs Across Different Sections of a Research Paper
- Can Overusing Modal Verbs Weaken Your Academic Writing?
- Professional Support for Polishing Modal Verb Usage
- Frequently Asked Questions
Glossary of Key Terms
| Term | Definition |
| Modal verb | An auxiliary verb that expresses necessity, possibility, permission, ability, or obligation and is followed by the base form of a main verb. |
| Semi-modal verb | A verb phrase, such as have to, need to, or ought to, that functions like a modal verb but follows slightly different grammar rules. |
| Hedging | The use of cautious language to soften claims and acknowledge the limitations of a study or argument. |
| Boosting | The use of strong, confident language, such as will or must, to emphasize certainty in a claim. |
| Epistemic modality | The use of modal verbs to express the writer’s degree of certainty or knowledge about a statement. |
| Deontic modality | The use of modal verbs to express obligation, permission, or necessity rather than certainty. |
| Register | The level of formality that is appropriate for a particular audience, discipline, or context. |
| Auxiliary verb | A helping verb that is used with a main verb to express tense, mood, or voice. |
What Are Modal Verbs in Academic Writing?
Modal verbs are auxiliary verbs, including can, could, may, might, must, shall, should, will, and would, that combine with a main verb to signal possibility, necessity, ability, or obligation. In academic writing, they let a writer calibrate exactly how confident, tentative, or obligatory a statement is, which is essential for representing research findings accurately.
Because modal verbs sit between plain fact and plain opinion, they are one of the most important tools for controlling tone in a dissertation, research paper, or research proposal. Choosing the wrong modal verb can make a tentative finding sound like an established fact, or make a well-supported conclusion sound unnecessarily uncertain.
Why Modal Verbs Matter in Academic Writing
Academic writing values precision and calibrated confidence, and modal verbs are the primary grammatical tool for expressing how certain, necessary, or possible a claim is. Reviewers and readers rely on these small words to judge how much weight a statement should carry.
Hedging and Cautious Language
Hedging allows writers to avoid overstating claims that are not fully supported by the available data.
- Common hedging modals include may, might, could, and would.
- Hedging protects a writer’s credibility if later research produces different results.
- Appropriate hedging is expected in fields such as medicine, social science, and any discipline with inherent uncertainty.
Expressing Certainty and Necessity
Certainty and necessity modals communicate confidence and obligation, and should be reserved for claims with strong support.
- High-certainty modals, such as will and must, are appropriate for well-established facts or conclusions with strong evidence.
- Necessity modals, including must, should, have to, and need to, communicate requirements or strong recommendations.
- Overusing high-certainty modals for preliminary results can make an argument look unsupported or overconfident.
Types of Modal Verbs Used in Academic Writing
Modal verbs used in academic texts generally fall into a small number of functional categories, summarized in the table below.
| Category | Modal Verbs | Typical Function |
| Possibility or probability | may, might, could | Indicate that something is possible but not confirmed |
| Necessity or obligation | must, should, have to, need to | Indicate a requirement or strong recommendation |
| Ability or capacity | can, could | Indicate capability or feasibility |
| Permission | may, can | Indicate that an action is allowed |
| Prediction or future certainty | will, would | Indicate an expected outcome or hypothetical result |
Modals of Possibility and Probability
- May: a moderate degree of possibility, typically used in formal academic contexts.
- Might: a slightly lower degree of possibility than may, often used for tentative or exploratory claims.
- Could: possibility based on circumstance, capability, or hypothetical conditions.
Example:
- These findings may indicate a link between sleep duration and memory consolidation, although further replication is required.
- The unexpected absence of a relationship between gender and income might be explained by …
- A future longitudinal study could explore this finding further by …
Modals of Necessity and Obligation
- Must: strong necessity, typically used for critical requirements or conclusions backed by strong evidence.
- Should: a recommendation or expectation, weaker in force than must.
- Have to and need to: necessity expressed in procedural or less formal academic contexts.
Example:
- Researchers should account for seasonal variation when interpreting the enrollment data.
- Authors must provide sufficient detail about sample size calculation and sampling strategy.
- Our findings indicate that nurses need to adopt pre-emptive strategies to…
Modals of Ability and Capacity
- Can: general ability, capacity, or possibility in present or ongoing contexts.
- Could: ability in past contexts, or a more tentative, polite version of can.
Example:
This model can process large, unstructured data sets more efficiently than earlier approaches could.
Modal Verbs and Tone: Balancing Confidence and Caution
Every modal verb sits somewhere on a spectrum from tentative to certain, and academic writers move along that spectrum depending on the strength of their evidence.
| Strength Level | Representative Modal Verbs | When to Use |
| High certainty | will, must | Established facts, strong statistical evidence, or logical necessity |
| Moderate certainty | should, would, can | Reasonable expectations, general recommendations, or typical capability |
| Low certainty or tentative | may, might, could | Preliminary findings, exploratory claims, or hypotheses |
Common Modal Verbs and Their Academic Functions
The table below summarizes the nine core modal verbs most frequently used in academic writing, along with their typical strength, function, and an example sentence.
| Modal Verb | Strength | Common Function | Example |
| Can | Neutral | Ability, general possibility | This method can identify small variations in temperature. |
| Could | Low | Tentative possibility, past ability | The results could indicate a seasonal effect. |
| May | Low to moderate | Possibility, formal permission | This finding may explain the observed variance. |
| Might | Low | Tentative possibility | Further studies might reveal additional variables. |
| Must | High | Strong necessity or conclusion | The data must be interpreted with the sample size in mind. |
| Shall | High, formal | Formal obligation, mainly in legal or policy texts | The committee shall review all submissions. |
| Should | Moderate | Recommendation, expectation | Researchers should consider confounding variables. |
| Will | High | Prediction, established fact | This approach will reduce processing time significantly. |
| Would | Moderate | Hypothetical, polite conditional | This would suggest a stronger effect under controlled conditions. |
Examples of Modal Verbs in Academic Sentences
The following examples show how modal verb choice shifts across different parts of a typical research paper.
- Hypothesis: Increased screen time might be associated with reduced attention span in adolescents.
- Methodology: Participants could withdraw from the study at any point without penalty.
- Results: The intervention group showed a measurable improvement, which may reflect the effect of the treatment protocol.
- Discussion: These results should be interpreted with caution given the limited sample size.
- Conclusion: Future research must address the long-term effects that this study was not designed to capture.
Common Mistakes with Modal Verbs in Academic Writing
- Using will to state findings that have not yet been proven, which overstates certainty.
- Mixing modal strength inconsistently within the same paragraph, which confuses the reader about how confident the writer actually is.
- Overusing might and could throughout a paper, which can make even strong findings sound weak or unsupported.
- Using double modals, such as might could, which are not standard in formal academic English.
- Dropping the base verb form after a modal, for example writing can to analyze instead of can analyze.
- Relying on the same one or two modal verbs throughout an entire manuscript instead of varying strength to match the evidence.
These issues are easy to miss during self-review, which is why many researchers, especially multilingual authors, choose to have a manuscript checked by Editage’s English editing service before submission, since a trained editor can flag inconsistent or overstated modal verb usage that a spell-checker will not catch.
Tips for Using Modal Verbs Effectively
- Match the strength of the modal verb to the strength of the supporting evidence: strong data supports must or will, while preliminary data supports may or might.
- Keep modal verb usage consistent within a single paragraph or argument so the reader is not left guessing how confident the writer really is.
- Avoid stacking modals or hedges, such as might possibly or could perhaps, which sound repetitive and unclear.
- Read key sentences aloud, or have a colleague read them, to check whether the tone matches the intended level of confidence.
- Vary modal verb choice across sections: hedge more in the introduction and discussion, and state facts more directly in the methodology and results.
- When in doubt, have a second set of eyes review the manuscript; Editage’s English editing service specializes in refining tone, style, and grammar for non-native and native English speaking researchers alike.
Modal Verbs Across Different Sections of a Research Paper
The appropriate modal verb often depends on which section of the paper is being written, since each section carries a different expectation about certainty.
| Section | Recommended Modal Verbs | Purpose |
| Introduction | may, might, could | Introduce open questions or gaps in existing research |
| Literature review | may, might, would | Describe prior findings without overstating their certainty |
| Methodology | can, will | Describe procedures, capabilities, and planned steps |
| Results | minimal modal use | State observed outcomes directly and factually |
| Discussion | may, might, could, should | Interpret findings cautiously and note limitations |
| Conclusion | should, may, could | Suggest implications, recommendations, and future work |
Can Overusing Modal Verbs Weaken Your Academic Writing?
Yes, overusing modal verbs, particularly weak hedges like might or could, can make an argument sound uncertain even when the underlying evidence is strong, so writers should reserve heavy hedging for genuinely tentative claims.
The opposite problem is just as common: overusing strong modals such as will or must for preliminary results can make a paper appear overconfident, which reviewers are quick to flag. The goal is balance, not avoidance.
- Read through a full draft and highlight every modal verb to check for repeated overuse of a single word.
- Ask whether each modal verb accurately reflects the strength of the evidence directly beside it.
- Vary sentence structure so that hedging does not always fall on the same modal verb.
Professional Support for Polishing Modal Verb Usage
Modal verb nuance is one of the more difficult aspects of English to master, particularly for researchers who are not native English speakers, since the difference between may and might, or between should and must, can shift the entire meaning of a sentence.
A subject matter aware language editor can review a full manuscript for consistent tone, appropriate hedging, and discipline-specific conventions. Editage’s English editing service is one option researchers commonly use to have their modal verb usage, along with grammar, clarity, and journal formatting, reviewed before submission.
Frequently Asked Questions
What is the difference between can and could in academic writing?
Can expresses present ability or general possibility, while could expresses past ability, hypothetical possibility, or a more tentative, polite version of can. For example, “this method can measure X” states a current capability, while “this method could measure X under different conditions” states a hypothetical one.
Is it acceptable to use will in a research paper?
Yes, will is acceptable when describing planned actions, such as methodology steps, or when stating a conclusion backed by strong evidence. It is generally not appropriate for tentative findings, where may or might is a better fit.
Which modal verb is best for making strong recommendations in academic writing?
Should is the standard modal verb for strong recommendations, while must is reserved for stricter necessity. For example, “researchers should replicate this study in a larger sample” is a common, appropriately measured recommendation.
Can a sentence start with a modal verb in formal academic writing?
Yes, but this construction is mainly used for questions, such as “could this effect be explained by confounding variables”, rather than for declarative statements, which typically place the modal verb after the subject.
What is the most commonly used modal verb in academic writing?
Corpus studies of academic English consistently show that can, will, and would are among the most frequent modal verbs, while may and could are the most common choices specifically for hedging claims.
Do British and American academic English use modal verbs differently?
The core modal verbs are used similarly in both varieties, though shall appears more often in British formal and legal writing, and American academic English favors will and should in comparable contexts.
Are modal verbs a form of hedging language in research papers?
Yes, modal verbs such as may, might, and could are among the most common hedging devices in academic English, alongside phrases like it is possible that or appears to suggest.
Which modal verb should I use to describe research findings in a discussion section?
May, might, and could are generally the safest choices for interpreting findings in a discussion section, since this section typically involves interpretation rather than proven fact, and should reflect the actual strength of the evidence.
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