Modal Verbs
Use can, could, must, should, may, might, will, and would to talk about ability, permission, possibility, obligation, and advice.
What modal verbs do
Modal verbs are little helper verbs that change the meaning of the main verb — adding ideas like ability, permission, possibility, obligation, or advice. They follow a few simple rules that are the same for every modal.
One main verb, many meanings: I can swim. (ability) · You must stop. (obligation) You should rest. (advice) · It might rain. (possibility)
The golden rules of modals
Every modal verb follows the same four rules — learn them once and they work for all of them.
Modal + base verb (no "to")
No -s for he / she / it
Negative = modal + not
Questions = modal before subject
Can & could — ability and requests
The most common modals at A2. Use can for the present and could for the past — or for polite requests.
Present ability — can / can't
Past ability — could / couldn't
Requests & permission
The other key modals
Each modal has its own job. Here are the most useful meanings.
| Modal | Main meaning | Example |
|---|---|---|
| must / have to | obligation, necessity | You must wear a seatbelt. |
| mustn't | prohibition (not allowed) | You mustn't smoke here. |
| don't have to | no obligation (not necessary) | You don't have to come. |
| should / ought to | advice | You should see a doctor. |
| may / might | possibility | It might rain later. |
| may / could | permission (formal/polite) | May I come in? |
| will / won't | future, willingness, offers | I will help you. |
| would | polite requests, hypotheticals | Would you like some tea? |
| must / can't | deduction (sure / impossible) | He must be tired. · That can't be true. |
Common mistakes
Practice & score yourself
Ten quick questions. You get instant scoring and a short explanation for every answer — especially when you get one wrong.
Part A — Choose the correct modal
Teaching ideas
Communicative ways to practice modals at A2–B1.
Talent-show survey
Students claim talents, then survey a partner ("Can you…? Could you when you were five?") and report back. Hits can/could, questions, and short answers.
Agony aunt
Give a problem; students write advice with should/ought to ("You should…"). Personal problems make the advice modal meaningful.
House rules poster
Students design rules for a club using must / mustn't / don't have to. Forces the obligation contrasts that learners confuse.
What's in the bag?
Show a mystery object's shadow; students speculate with might / could / must be. Natural possibility and deduction practice.
Politeness ladder
Rank requests from direct to polite (Can → Could → Would you mind…). Builds register awareness with modals.
Modal error hunt
Project sentences with classic slips ("She cans", "can to swim"); students fix them and say the rule. Trains self-correction.
The one rule to remember
Every modal works the same way: subject + modal + base verb — no "to", no -s, and no do/does for negatives or questions. Once that pattern is automatic, you only need to learn what each modal means.
Modal Verbs
Modal verbs are an essential part of English grammar, as they indicate a speaker’s attitude, necessity, possibility, or permission related to the main verb in a sentence. Modal verbs are used to modify the meaning of the main verb and are often used in combination with it. They express various shades of meaning, including ability, permission, obligation, necessity, probability, and more.
Modal Verbs in English
Modal verbs are auxiliary verbs that express necessity, possibility, permission, ability, or other conditions. They are used before the base form of the main verb and do not change form according to the subject. Here’s a comprehensive guide to understanding and using modal verbs effectively.
Common Modal Verbs and Their Uses
- Can
- Ability: She can swim very well.
- Permission: Can I leave early?
- Possibility: It can be dangerous.
- Could
- Past ability: He could run fast when he was young.
- Polite request: Could you pass the salt?
- Possibility: It could rain tomorrow.
- May
- Permission: May I use your phone?
- Possibility: We may go to the park if it stops raining.
- Might
- Possibility: She might come to the party.
- Suggestion: You might want to check the weather before leaving.
- Must
- Necessity/Obligation: You must wear a seatbelt.
- Strong conclusion: He must be the new manager.
- Shall
- Future action (formal): I shall return by evening.
- Suggestion: Shall we dance?
- Should
- Advice: You should see a doctor.
- Expectation: The train should arrive by noon.
- Will
- Future action: They will visit us next week.
- Willingness: I will help you with that.
- Would
- Polite request: Would you like some tea?
- Past habitual action: When I was a child, I would play outside all day.
- Conditional: If I were you, I would apologize.
Forming Sentences with Modal Verbs
Structure: Subject + modal verb + base form of the main verb
- Affirmative: She can sing beautifully.
- Negative: He cannot (can’t) come to the party.
- Question: Can you help me?
Examples in Different Contexts
Ability:
- Present: I can speak French.
- Past: She could dance well when she was younger.
Permission:
- Formal: May I come in?
- Informal: Can I borrow your pen?
Possibility:
- Present/Future: It might rain today.
- Past: They could have been delayed by traffic.
Necessity/Obligation:
- Present: You must finish your homework.
- Advice: You should rest if you’re tired.
Requests:
- Polite: Would you mind closing the window?
- Direct: Can you help me with this?
Suggestions:
- **Shall we go for a walk?
- **You might want to reconsider your decision.
Future Actions:
- Certain: We will arrive by 8 PM.
Planned: I shall attend the meeting
Here’s an overview of modal verb grammar:
Modal Verbs
- Can: ability, possibility, permission
- Could: past ability, possibility, politeness
- May: permission, possibility, uncertainty
- Might: possibility, uncertainty, polite suggestions
- Must: necessity, obligation
- Shall: offers, suggestions (primarily in British English)
- Should: advice, recommendation, obligation, expectation
- Will: future intention, prediction, willingness
- Would: polite requests, hypotheticals, polite expressions
No Infinitive ‘To’: Modal verbs are followed by the base form of the main verb without “to.” For example:
- She can swim. (NOT “She can to swim.”)
Negation: The negative form of modal verbs is created by adding “not” after the modal verb. For example:
- He should not go. (Negative of “He should go.”)
Questions: Modal verbs are often used to form questions without the need for additional auxiliary verbs. For example:
- Can you help me?
- Should we go now?
Modal + Base Verb: Modal verbs are used with the base form of the main verb. If the main verb is a base verb, it does not take the “-s” ending in the third person singular (he/she/it). For example:
- She can play the piano. (NOT “She can plays the piano.”)
Modal + ‘Have’ (Perfect Aspect): Modal verbs can be combined with “have” to express the perfect aspect. For example:
- They must have finished the project. (Expresses a past necessity that was completed.)
Modal + ‘Be’ (Continuous Aspect): Modal verbs can also be combined with “be” to express the continuous aspect. For example:
- She might be studying for the exam. (Expresses a possibility in the present, emphasizing the ongoing action.)
Modal Verb Combinations: In some cases, modal verbs can be combined for added emphasis or to convey more nuanced meanings. For example: You should have been more careful. (Combination of “should” and “have been” for past advice and regret)
Remember that the usage of modal verbs can vary based on context, level of formality, and regional differences in English. Understanding modal verb grammar is crucial for effective communication in English.
Modal Verbs – Example Sentences + Simple Explanations
Obligation / Necessity
- Sentence: You must wear a helmet when you ride a bike.
- Why: “Must” shows something is necessary or a rule.
- Sentence: I have to finish my homework before dinner.
- Why: “Have to” also shows something is required, like an obligation.
No Obligation / Permission
- Sentence: You don’t have to come to the meeting if you’re busy.
- Why: “Don’t have to” shows it is not necessary.
- Sentence: You can borrow my pen.
- Why: “Can” shows permission – it’s allowed.
Advice / Recommendation
- Sentence: You should eat more vegetables.
- Why: “Should” gives advice.
- Sentence: You ought to try this book.
- Why: “Ought to” also gives suggestion or advice.
Possibility / Probability
- Sentence: It might rain tomorrow.
- Why: “Might” shows something is possible but not certain.
- Sentence: She could be at the library now.
- Why: “Could” shows it’s possible.
Deduction / Certainty
- Sentence: He must be tired; he worked all night.
- Why: “Must” shows we think something is very likely.
- Sentence: That can’t be true; it’s impossible.
- Why: “Can’t” shows strong deduction – we are sure it’s not true.
Ability
- Sentence: I can swim very fast.
- Why: “Can” shows ability – something you are able to do.
- Sentence: She is able to speak three languages.
- Why: “Be able to” also shows ability (like “can”).
Past Modals (Talking About the Past)
- Sentence: He must have left his keys at home.
- Why: “Must have” shows strong guess about the past.
- Sentence: I should have studied more for the test.
- Why: “Should have” shows regret or criticism about the past.
- Sentence: They might have missed the bus.
- Why: “Might have” shows possible action in the past.
- Sentence: She can’t have done it alone.
- Why: “Can’t have” shows we are sure something did not happen in the past.