（三）几组词的辨异女神 调教
1. can 和be able to
1）神志动词can只消两种时态体式，当今式can和夙昔式could，而be able to有多种时态体式。
Mary can play the piano. She has been able to play it since she was 5.
玛丽会弹钢琴。她五岁起就会弹了。
2）用在夙昔时中，could常常默示简略作念某事，事实上不一定去作念，而was∕were able to则默示“夙昔作念成了某事”。在含糊句中两者可通用。
He could swim across the English Channel. But he didn't feel like it that day.
他能游过英安逸海峡，但那天他不念念游。
Yesterday I was able to get home before the heavy rain. 昨天我不才大雨前赶到了家里。
2. must和 have to
must默示主不雅表示，而have to默示由于客不雅成分不得不作念某事。must莫得夙昔式，除在曲折引语中可用于默示夙昔本事，在获胜引语中默示夙昔本事应该用had to代替。
I told her that she must give up smoking. 我叫她必须戒烟。
We had to get everything ready that night. 咱们那晚得把一切准备就绪。
3. would和used to
1）used to默示夙昔与当今或夙昔某时与自后的情况有不同，而would只表夙昔的情况。
People used to think that the earth was flat.
夙昔东说念主们以为地球是平的。（当今东说念主们不这样以为。）
She would go out for a walk in the morning when she was in the country.
在乡下时，她老是在清晨去散会儿步。（可能当今仍有散播的风俗。）
2）used to可默示夙昔的风俗手脚和常常的情况，而would只默示夙昔的风俗手脚。
He used to ∕would smoke while writing. 夙昔他写东西不绝吸烟。
She used to be fat. 她夙昔很胖。
1. I __________ you，because I thought I must be wrong.
A. dare not ask B. dare not to ask 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. “__________ I take it out？” “I'm sorry，you __________.”
A. Could …couldn't B. Might…might not C. Could…can D. May…can't
4. You were stupid to climb the tree. You __________ hurt yourself.
A. may B. might C. will D. might have
5. You __________ those letters. Why didn't you ？
A. should post B. should have posted C. must have posted D. ought to post.
6. All the lights are on，the Smiths __________ up.
A. must get B. is getting C. must be getting D. would get
7. He __________ lead a horse to the water but he __________ not make it drink.
A. will…can B. may…can C. may…dares D. dare…can
8. “Need we do this job now？” “Yes，__________.”
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.
丝袜avA. 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
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1.A2.B3.D4.D5.B6.C7.B8.C9.B10.D11.D12.C13.B14.B15.D16.B17.A18.D19.A20.C女神 调教