Exercise on Modal Verbs and their Substitutes

Use modal verbs where possible. If a modal verb can't be used with a certain tense, use its substitute.

1. You (must) get up early tomorrow.
2. You (not / need) call a baby sitter.
3. We (may) watch the film tonight.
4. He (not / can) see me yesterday.
5. She (must) stay at school yesterday afternoon.
6. (may / you) go to the disco yesterday?
7. He (not / must) sleep now.
8. You (not / need) answer.
9. He (ought to) give evidence at the court yesterday.
10. Since he bought the new car he (not / can) sleep.