MODAL (DEFECTIVE). SEMI-MODAL, PERIPHRASIS.

1 CHOOSE THE BEST FORM. (Sometimes both may be possible.)
1. We may win, but I don't think there's much chance. (may, might)

2. I might ask you to help me later. (may, might)

3. That can't be her daughter - they're nearly the same age .(can't, mustn't)

4 . We may decide to go camping again at Easter. (can, may)

5. There may not be enough room for everybody on the bus - we'll have to wait  and see. (may not, can't)

6. You can't get in without a ticket -not a chance. (may not, can't)
 
7. You absolutely must go and see Liz. (should, must)

8. I think you should try to relax more. (should, must)

9. You have to pass a special exam to be a teacher. (must, have to)

10. In this country, boys don't have to do military service. ( must not, don't have to)

11. I will be able to see you at eight tomorrow. (can, will be able to)

12. One day, everybody will be able to  say what they like. (can, will be able to)

13. It took a long time, but I could repair the car. (could, managed to)

14. When I was younger I could sing quite well. (could, was able to)

15. At what age can you get a driving licence? (can, may)

16. I promise I will stop smoking. (stop, will stop)

17. I don't know why she's not here. She may not have got my message. (may not, can't)

18. He's not answering the phone. He may not have got home yet. (may not, can't)

19. When I was eighteen we had to do two years in the army. (had to do, must have done)

20. She must have left very quietly - I didn't hear her go. (had to leave, must have left)