Complete the sentences with any appropriate form or have to. Include any words in parentheses.

1. Do you have to .... have to

2. had to ....Did you have to

3. doesn't have to

4. don't have to /won't have to

5. have had to

6. did Tom have to

7. don't have to /won't have to

8. Did John have to

9. has had to

10. will have had to

11. Don't you have to

12. will have to/ is going to have to ....Does she have to/ Will she have to

13. didn't have to

14. haven't had to

(Tư liệu tham khảo: Betty Schrampfer Azar. Understanding and Using English Grammar.3rd ed).

Review exercise