Exercise on Modal Verbs and their Substitutes
Choose the correct substitute for each modal verb.
1. We ought to win the race. → We ……….. win the race.
· We ought to win the race. → We are supposed to win the race.
· Ought to = supposed to
2. I can swim. → I ……….. swim.
· I can swim. → I am able to swim.
· Can = be able to
‘Can = be allowed to
3. You must meet my best friend. → You ………. meet my best friend.
· You must meet my best friend. → You have to meet my best friend.
· Must = have to
4. Should I go to the cinema with them? → ……… go to the cinema with them?
· Should I go to the cinema with them? → Am I supposed to go to the cinema with them?
· Should = be supposed to
5. They may stay up late. → They ………. stay up late.
· They may stay up late. → They are allowed to stay up late.
· May = be allowed to
6. She needs to see the doctor. → She ………. see the doctor.
· She needs to see the doctor. → She has to see the doctor.
· Needs = have / has to
Use modal verbs where possible. If a modal verb can't be used with a certain tense, use its substitute.
7. (may / you) ………. go to the disco yesterday?
· Were you allowed to go to the disco yesterday?
· The modal verb ‘may’ cannot be use in past tense, we have to use the auxiliary
8. He (ought to) ………. give evidence at the court yesterday
· He was supposed to give evidence at the court yesterday
· The modal verb ‘ought’ cannot be used in past tense, we have to use the auxiliary. Ought to = be supposed to / be expected to / be to
9. Since he bought the new car he (not / can) ………. sleep.
· Since he bought the new car he has not been able to sleep.
· The modal verb ‘can’ cannot be used as a participle, we have to use the auxiliary. Can=be able
10. He (not / must) ………. sleep now.
· He must not sleep now
· The modal verb can be used in present tense.
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