to hand in this morning, so I had to finish it last night.作文今天早晨到期，因此我不得不昨天晚上完成。
易混点六: used to do / be used to doing / be used to do…/ be used for doing sth used to do表示过去常常发生的动作，强调过去，只用于过去，注意用to do，不用doing形式；
be used to doing意为“习惯做…”，be可有各种时态；
be used to do意为“……被使用去做……,”为被动语态形式。
be used for doing sth“用作……”如：My father used to eating meat.我父亲过去起床晚，但现在不得不早起了。She is used to eating meat.她习惯吃肉。He wasn’t used to eating in a restaurant.他不习惯在饭店吃饭。A knife can be used for cutting things.(刀可以用来割东西)/ A knife can be used to cut things.(刀可以用来割东西)
经典练习题：
1. I __________ you, because I I must be wrong.
A. dare not ask B. dare not C. dare not asking D. dare to not ask 2. There __________ some flowers in the garden.
A. were used to be B. used to be C. uses to be D. used to be having 3. \ \
A. Could ...couldn't B. Might...might not C. Could...can D. May...can't
4. You were stupid to climb tree. You __________ hurt yourself. A. may didn't you ?
A. should post B. should have posted C. must have posted D. ought to post.
6. All the lights are on, miths __________ up.
A. must get B. is getting C. must be getting D. would get 7. He __________ lead a but he __________ not make it drink.
A. will...can B. may...can C. may...dares D. dare...can 8. \ \
A. you need B. you should C. you must D. you can 9. __________ to have lunch with us today? A. Do you likes B. Would you like C. Will you liked D. Have you liked 10. He said that you __________ watch TV all the evening if you wished. A. may B. must C. can D. might
11. -Is John coming by train? --He should, but he __________ not. He likes driving his car.
A. must B. can C. need D. may
12. Peter __________ come with us tonight, but he isn't very sure yet. A. must B. can C. may D. will
13. Michael __________ be a policeman, for he's much too short. A. needn't B. can't C. shouldn't D. won't
14. I thought you __________ be hungry, so I have brought you some cakes.
A. may B. might C. can D. could 15. I wonder how he __________ that to the teacher.
A. dare to say B. dare saying C. not dare say D. dared say 16. Come on! We __________ hurry because there isn't much time left. A. may B. must C. can D. need
17. Amy did best in the English test. She __________ hard last week.
A. must have working B. should have worked C. should work D. must work
18. The fire spread through the hotel very quickly but everyone __________ get out.
A. had to B. would C. could D. was able to
19. ---I stayed at a hotel while in New York. ---Oh, did you? You __________ with Barbara. A. could have stayed B. could stay C. would stay D. must have stayed 20. It's nearly seven o'clock. Jack __________ be here at any moment. A. must B. need C. should D. can 答案：
1.A2.B3.D4.D5.B6.C7.B8.C9.B10.D11.D12.C13.B14.B15.D16.B17.A18.D19.A20.C
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