1 can

2 couldn't

3 could have gone

4 shouldn't have told

5 don't have to

6 had to

7 couldn’t have been

8 Did you have to

9 mustn’t

10 should

Verified answer

1. can

2. couldn't

3. could have gone

4. shouldn't have told

5. don't need to

6. had to

7. can't have been

8. Did you need to

9. may not

10. might be