人教版高一英语必修三Unit2情态动词grammarppt课件

1、GrammarModal Modal VerbVerb 情态动词有一定的意义，但没有人称和情态动词有一定的意义，但没有人称和数的变化，不能独立使用，它和后面的动词数的变化，不能独立使用，它和后面的动词构成谓语除构成谓语除ought 和和have 外，后面只能接外，后面只能接不带不带to 的不定式。的不定式。 只作情态动词的只作情态动词的 can / could, may / might, ought to, must 可情态可实义的可情态可实义的need, dare 可情态可助动词的可情态可助动词的 shall / should, will / would相当于情态动词的相当于情态动词的 ha

2、ve to, used toEveryone here can speak English.-Could I have a look at your notebook?-Yes, you can. / No, you cant. It cant be Mary. She has fallen ill.Can this news be true?Where can they be?She cant have left school, for her bike is still here.The monkeys look sweet, but they can be very naughty.Sh

3、e can / is able to sing the song in English.I could read when I was four. The fire spread through the hotel quickly but everyone was able to get out.情态动词情态动词 含义含义否定式否定式 注意点注意点can / could表能力表能力“能，会能，会”cant“不会，不能不会，不能”区别区别 be able to表许可表许可“可以可以”cant “不可以，不许不可以，不许”代替代替may表推测表推测“可能可能”cant “不可能不可能”主要用于主要

4、用于否定、否定、疑问句疑问句中中1表示某人通过努力克服困难做成某事表示某人通过努力克服困难做成某事,要用要用was / were able to.2 could, might, would 表委婉语气用于疑问句表委婉语气用于疑问句, 答语仍须用答语仍须用 can, may, will.3 can 用于肯定句中用于肯定句中, 可表示有时可能可表示有时可能”-May I use your pencil?-Yes, you may. / No, you mustnt.She may not be working now. John might be at home now.Helen may go

5、on the trip with us, but she isnt very sure yet.She may / might have read it in the paper.He may not have finished reading the book.情态动词情态动词 含义含义否定式否定式 注注 意意 点点may /might表许可表许可“可以可以”mustnt “不许，严禁不许，严禁”口语中也可用口语中也可用cant表推测表推测“可能可能”May not“可能不可能不”主要主要用于用于肯定肯定句，句，不不能用在能用在疑问疑问句句 （may not 可能不）可能不）If you w

6、ill help me with my English, I will be very happy. I promised that I would do my best.Will you tell me something about your hometown? Would you please speak again more slowly？He will always take a walk after supper. During the vacation he would often visit me. 情态动词情态动词 用用 法法will表请求表请求(第二人称第二人称)表意志表意

7、志,意愿意愿表某种倾向表某种倾向或习惯或习惯would更客气的更客气的请求请求过去的过去的意志意志,意意愿愿过去的倾向过去的倾向或习惯或习惯Shall we set off now? You shall do as I say.Tell him that he shall have the book tomorrow. You shall be punished if you do that again.You shouldnt /oughtnt to smoke so much.She shouldnt have left without saying a word.Its five ocl

8、ock. John should be at home now. We have prepared a fridge of food and drinks. That ought to be enough for the party.Its a pity that he should be so rude to a lady.情态动词情态动词 用用 法法shall征求对方意见征求对方意见(第一第一, 三人称三人称)表示命令表示命令,警告警告, 威胁或威胁或允诺允诺 (第二第二, 三人称三人称) should / ought to表示劝告表示劝告,建议建议,命令或责任命令或责任“应该应该, 必须

9、必须”表示推测表示推测, “理应理应, 估估计计, 大概大概, 可望可望”should 还可还可表示表示“竟然竟然”- Must I finish all assignments at a time?-Yes, you must. / No, you neednt. I dont like this TV set. We must buy a new one. There was no more bus. They had to walk home.You must be the new teacher. There is nobody here. They must have all gon

10、e home.My MP4 isnt in my bag. Where can I have put it?John, look at the time. Must you play the piano at such a late hour?情态动词情态动词 含义含义否定式否定式注意点注意点must表必要表必要“必须必须”neednt“不必不必”( 区别区别 have to)有时表有时表“偏要偏要”表推测表推测“一定一定” cant“不可能不可能”只能只能用于用于肯定肯定句，句，不能不能用于用于否定、疑问句否定、疑问句1. A computer _ think for itself; it

11、must be told what to do. A. cant B. couldnt C. may not D. might not2. The fire spread through the hotel very quickly but everyone _ get out. A. had to B. would C. could D. was able toA D 4. That big cinema _ seat 2,000 people.A. can B. should C. ought to D. is able toA 5. Could I borrow your diction

12、ary? Yes, of course you _. A. might B. will C. can D. should6. Might I watch TV after supper? Yes, you _. A. may B. must C. might D. canC A 7. You _ return the book now. You can keep it till next week if you like. A. cant B. mustnt C. neednt D. may not8. Johnny, you _ play with the knife, you _ hurt

13、 yourself. A. wont ; cant B. mustnt ; may C. shouldnt ; must D. cant ; shouldntC B 9. -Will you stay for lunch? -Sorry, _. My brother is coming to see me. A. I mustnt B. I cant C. I neednt D. I wont10. -May I pick a flower in the garden? - _. A. No, you neednt B. Not, please. C. No, you mustnt D. No

14、, you wontB C 11. Put on more clothes. You be feeling cold with only a shirt on. A. can B. could C. must D. would12. Must I drive to his house and pick up the children? No, . A. you shouldnt B. you might not C. you neednt D. you mustntC C 13. We didnt see Tom at the meeting yesterday. He it. A. must

15、nt have attended B. cannot have attended C. neednt have attended D. would have not attended14. We play chess than bridge. Some of us dont know how to play bridge. A. had better B. would better C. would rather D. had ratherB A 15. There is someone knocking at the door. it be Tom? A. Can B. Must C. Sh

16、ould D. Ought to16. Two year ago, my husband bought me a bicycle. If you live in town, it is often faster than a car and you worry about parking. A. must not B. may not C. should not D. dont have toA D 17.-Is John coming by train? -He should, but he _ not. He likes driving his car. A. must B. can C.

17、 need D. may19.-I heard they went skiing in the mountains last winter. -It _ true because there was little snow there. A. may not be B. wont be C. couldnt be D. mustnt beDC全国高考试题回放1.A left-luggage office is a place where bags _be left for a short time, especially at a railway station.A.should B.can

18、C.must D.will2.How _ you say that you really understand the whole story if you have covered only part of the article?A.can B.must C.need D.may3.The room is so dirty._ we clean it? Of course.A.Will B.Shall C.Would D.DoBAB4.My English-Chinese dictionary has disappeared. Who _ have taken it?A.should B.

19、must C.could D.would5.Is John coming by train?He should, but he _ not. He likes driving his car.A.must B.can C.need D. may6.I heard they went skiing in the mountains last winter.-It _ true because there was little snow there.A.may not be B.wont beC.couldt be D. mustnt beCDC10.I was really anxious ab

20、out you. You _ home without a word.A. mustnt leave B. shouldnt have leftC. couldnt have left D. neednt leave11.You cant imagine that a well-behaved gentlemen _ be so rude to a lady.A.might B.need C.should D.would12.Write to me when you get home. _.A.I must B.I should C.I will D.I canBCC13.Mr.Bush is

21、 on time for everything. How _it be that he was late for the opening ceremony?A.can B.should C.may D.must14.Are you coming to Jeffs party?Im not sure. I _ go to the concert instead.A.must B.would C.should D.might15.My sister met him at the Grand Theatre yesterday afternoon, so he _ your lecture.A. c

22、ouldnt have attended B. neednt have attendedC. mustnt have attended D. shouldnt have attendedADA16.Sorry, Im late. I _ have turned off the alarm clock and gone back to sleep again.A.might B.should C.can D.will17.There was a lot of fun at yesterdays party. You _ come, but why didnt you?A.must have B.

23、should C.need have D.ought to have18.When can I come for the photos? I need them tomorrow afternoon.They _ be ready by by 12:00.A.can B.should C.might D.needADB19.I stayed at a hotel while in New York.-Oh, did you? You _ with Barbara.A.could have stayed B.could stayC.would stay D.must have stayed20.

24、The fire spread through the hotel very quickly but everyone _ get out.A.had to B.would C.was able to D.could21.Jack _ yet, otherwise he would have telephoned me.A. mustnt have arrived B. shouldnt have arrivedC.cant have arrived D. neednt have arrivedA CC22.When he was there, he _ go to that coffee s

25、hop at the corner after work everyday.A.would B.should C.had better D.might23.Sir, you _ be sitting in this waiting room. It is for woman and children only.A. oughtnt to B.cant C.wont D. neednt24.Its nearly seven oclock. Jack _ be here at any moment.A.must B.need C.should D.canAAC25.I told Sally how

26、 to get here, but perhaps I _ for her.A.had to write it out B. must have written it outC.should have written it out D.ought to write it out26.Michael _ be a policeman, for he is much too short.A. neednt B.cant C.should D.mayCBDiscovering useful structures Ex. 1: 1. Most ancient festivals would celebrate the end of cold weather