1. Exercise on Modal Verbs and their Substitutes

2. Choose the correct substitute for each modal verb.
1. We ought to win the race.
→ We (are able to, are allowed to, are supposed to) win the race.
2. I can swim.
→ I (have to, am able to, am supposed to) swim.
3. You must meet my best friend.
→ You (have to, are able to, are allowed to) meet my best friend.
4. He should be in bed by now.
→ He (has to, is supposed to, is allowed to) be in bed by now.
5. I must get up early.
→ I (have to, am able to, am allowed to) get up early.

3. 6. They may stay up late.
→ They (have to, are allowed to, are supposed to) stay up late.
7. She needs to see the doctor.
→ She (has to, is allowed to, is able to) see the doctor.
8. We need not walk. →
We (do have to, are not able to, are not supposed to) walk.
9. You must not sleep →
You (do not have to, are not allowed to, are not able to) sleep.
10. Should I go to the cinema with them?
→ (Am I able to, Am I allowed to, Am I supposed to) go to the cinema with them?