一、判断下列各句中情态动词的使用是否正确，如果错误，请予以改正。
1. 去掉to
2. spoke→speak
3. speaking→speak
4. speaks→speak
5. cans→can
6. cans speaks→can speak
7. doesn’t can→can’t
8. Does he can→Can he
9. They must not do that again.
10. They must have done the work yesterday.
11. They must have done the work yesterday.
12. You had better do it at once.
二、用could，couldn’t，was / were able to填空。
13. were able to
14. could
15. was able to
16. couldn’t
17. was able to
18. was able to
19. could
20. were able to
21. couldn’t
22. was able to
23. could
24. was able to
25. was able to
26. was able to
27. was able to / could
三、根据所给情景礼貌地提出请求。（仅作参考）
28. May I ask you a question, please?
29. Can I use the phone?
30. Could you meet me in front of the library at three this afternoon?
31. May I come in, please?
32. Would you please check the oil?
33. Can I use your dictionary for a minute?
34. Would you please keep an eye on my luggage while I get a drink of water?
四、用must not或don’t have to填空。
35. don’t have to
36. must not
37. don’t have to
38. doesn’t have to
39. doesn’t have to
40. must not
41. don’t have to
42. don’t have to
43. must not
44. must not
五、用would或used to填空。
45. used to; would
46. used to
47. would
48. used to; would
六、用所给词的适当形式填空，以表示推测，注意肯定程度的不同。
49. can’t have had
50. must be
51. must have been
52. must have been
53. might not have seen
54. must be
55. must have been
56. must have forgotten
57. might not have seen
58. must have listened
59. must have left
60. must have taken
61. can’t / couldn’t have seen
62. must be
63. must have been
七、单项选择。
64. B　65. A　66. D　67. D　68. D　69. C　70. D　71. B　72. A