Modal Verbs Quiz
12 multiple-choice questions on can, could, may, might, must, should, will and would. Test ability, permission, obligation, advice and deduction.
This quiz checks how confidently you can apply Modal Verbs at B1 level, with questions built around real forms such as can, mustn't, May, must and couldn't rather than abstract rule statements. Each question presents a full example sentence, so you have to judge which form fits the meaning and structure correctly instead of recalling a rule in isolation.
If a question catches you out, the FAQ section below explains the underlying rule in more detail, including common mistakes learners make with this point. Reviewing the explanation immediately after an incorrect answer, then retrying the quiz on a different day, builds more durable grammar knowledge than repeating the same 12 questions back to back.
Modal Verbs — FAQ
What are modal verbs in English?
Modal verbs are auxiliary (helping) verbs that express possibility, ability, permission, obligation, or advice. The main modals are: can, could, may, might, must, shall, should, will, would, and ought to. They are followed by the base infinitive and do not change form — there is no -s in the third person singular.
What is the difference between 'must' and 'have to'?
'Must' implies the speaker's own feeling of obligation (internal): You must try this — it's delicious. 'Have to' implies external obligation from rules or other people: I have to wear a uniform at work. 'Have to' is more commonly used in questions and negatives since 'must' has no past tense form.
How do you use 'should' and 'ought to'?
'Should' expresses advice or a mild recommendation: You should see a doctor. 'Ought to' has the same meaning but is slightly more formal and less common in questions and negatives. 'Should have' expresses criticism or regret about the past: You should have called me.
What is the difference between 'can' and 'may' for permission?
Both are used to ask for or give permission, but 'may' is more formal. In everyday speech, 'can' is far more common: Can I sit here? 'May' is preferred in formal situations: May I leave the room? Traditionally 'can' referred only to ability, but this distinction has largely disappeared in modern English.
How do modal verbs express deduction?
'Must' expresses strong positive deduction (She must be tired — I'm almost sure). 'Can't' or 'couldn't' expresses strong negative deduction (That can't be right). 'Might', 'may', and 'could' express weaker possibility (He might be at home — I'm not sure). The degree of certainty decreases from must to might.
What is 'could have', 'should have', 'would have' used for?
These modal perfect forms refer to the past. 'Could have' = was possible but didn't happen. 'Should have' = was the right thing to do but didn't happen (regret/criticism). 'Would have' = the result of an unreal past condition. All follow: modal + have + past participle.
Can 'will' be used for present habits?
Yes. 'Will' can describe typical or characteristic behaviour in the present (He will sit and watch TV for hours). This usage expresses a predictable, characteristic pattern. It can sound slightly critical or resigned depending on context.
What is the difference between 'might' and 'may'?
'May' and 'might' both express possibility, but 'might' suggests a slightly lower probability. It may rain (fairly possible) vs It might rain (possible but less certain). In practice the distinction is subtle and they are often interchangeable. 'May' is also used for permission (formal), while 'might' is not.
Do modal verbs have past tense forms?
Most modals do not have simple past forms. 'Can' → 'could' (past ability), 'may' → 'might' (past possibility), 'will' → 'would' (past future). For past obligation, 'had to' is used instead of 'must'. For past permission, 'was/were allowed to' is used.
Can modal verbs be used in passive sentences?
Yes. Modal verbs can be combined with the passive: modal + be + past participle. Examples: The package should be delivered tomorrow. / The problem could be solved easily. The passive with modals carries the same modal meaning — obligation, possibility, advice — applied to the passive action.