15. You needn‘t go and see him.
16. You needn‘t have written to her.
17. You should have helped her.
18. If you would change this car, I should be very grateful.
19. Would you mind shutting the door?
20. She shouldn‘t have bought that house.
21. It‘s odd that she should say that.
22. Don‘t call him. He‘ll be taking a nap.
23. Don‘t write to him. He won‘t be home now.
24. Don‘t bother him. He will have heard the news.
25. A lion will attack people only when hungry.
26. What will you do after graduation?
27. Mary ought to be home by now.
28. You oughtn‘t to have bought a new car.
29. He used to work in Shanghai, but now he is nowhere to be found.
30. How dare you say that in the presence of the principal?
Ex. 17E
1. He may be working for Simons.
2. He may have been working for Simons.
3. He may be retiring next year.
4. He won‘t be working now.
5. He‘ll have heard it by now.
6. They may have been wondering what to do.
7. He can‘t have lost it.
8. They must be waiting.
9. That might be true.
10. She should be home by now.
11. She may have left it at home.
12. I may have been mistaken.
13. You must have been disappointed.
14. She won‘t have heard the news yet.
15. There must have been a mistake.
16. He won‘t be there.
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