OOPT Modal Verbs and Functions 2 — Questions and Answers

Question 1: Which sentence expresses a prohibition?

You don't have to wear a tie.
You mustn't park here. (Correct answer)
You might wear casual clothes.
You should wear formal clothes.

Correct answer: You mustn't park here.

'Mustn't' expresses a prohibition — it is forbidden to park here.

'Mustn't' (must not) expresses prohibition — something is forbidden: 'You mustn't park here.' This is different from 'don't have to', which expresses absence of obligation (it's not necessary but you can if you want). 'Might' expresses possibility and 'should' expresses advice.

Question 2: Choose the correct modal: 'The lights are on. She ___ be home.'

must (Correct answer)
should
would
shall

Correct answer: must

'Must' expresses logical deduction — the lights being on is evidence she is probably home.

'Must' expresses logical deduction/certainty based on evidence: seeing the lights on leads to the conclusion 'she must be home.' This is the epistemic use of 'must' (expressing logical certainty), distinct from deontic 'must' (obligation). 'Should' expresses expectation, 'would' expresses willingness/habit, and 'shall' offers or asks about the future.

Question 3: Complete: 'You ___ take an umbrella — it might rain.' (giving advice)

must
should (Correct answer)
shall
will

Correct answer: should

'Should' gives advice or a recommendation. 'You should take an umbrella' is a suggestion.

'Should' and 'ought to' express advice or recommendations: 'You should take an umbrella.' This is weaker than 'must' (obligation) and more direct than 'might want to'. The context 'it might rain' — uncertain future — supports advice rather than obligation. 'Shall' is typically for first-person offers or suggestions.

Question 4: Which sentence expresses past ability?

She can swim very well.
She could swim before her injury. (Correct answer)
She might have swum there.
She would swim every morning.

Correct answer: She could swim before her injury.

'Could swim before her injury' expresses a past ability that no longer exists.

'Could' as a past modal expresses general ability in the past: 'She could swim before her injury' = she had the ability to swim in the past. 'Can' is present ability. 'Would swim every morning' expresses past habit (not ability). 'Might have swum' expresses past possibility/speculation.

Question 5: Choose the correct form: 'You ___ have told me earlier — I could have helped.'

should (Correct answer)
could
might
would

Correct answer: should

'Should have told me' is a criticism or regret about a past action that didn't happen.

'Should have + past participle' expresses criticism of past behaviour or a missed obligation: 'You should have told me' = it was the right thing to do but you didn't. 'Could have told' = you had the opportunity. 'Might have told' = it was possible. 'Would have told' implies willingness.

Question 6: Which modal best expresses a formal request?

Can you close the window?
Would you mind closing the window? (Correct answer)
Close the window, please.
I want you to close the window.

Correct answer: Would you mind closing the window?

'Would you mind closing the window?' is the most formal and polite request.

Levels of formality in requests: 'Close the window' (imperative — direct), 'Can you close it?' (informal request), 'Could you close it?' (more polite), 'Would you close it?' (polite), 'Would you mind closing it?' (most polite/formal). 'Would you mind + -ing' is the most formal option here and used in professional and formal contexts.

OOPT Modal Verbs and Functions 2

Which sentence expresses a prohibition?