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1、一.情态动词不能单独作谓语，后接动词原形。二.情态动词的用法l can/could 的用法(1)表示能力，与be able to同义。但can只用于现在时和过去时(could),而be able to可用 于多种时态(was/were able to, will be able to)。例： He can speak English well. = He is able to speak English well.(2)表示推测，常用于疑问句和否定句中，can意为“可能，cant意为不可能二例：Bob cant be sleeping. The light in his room is sti
2、ll on.(3) Could用于一般疑问句表示委婉的请求。常用句型Could you please.?若表示同意时， 用can回答而不用could o例：Could you give me a hand?Yes, I can.2、must/have (has) to 的用法表示义务、命令或耍求，意为“必须”(主观意志)。例：We must do everything step by step.(2)在Must.？的句型中，肯定回答是Yes,主语+ must./ No,主语+ neednt./dont have to.例：Must I finish the work today?Yes, yo
3、u must.No, you neednt/dont have to.PS.否定回答不能用mustnt mustnt意为禁止，不允许”。例：You mustnt talk in class.表示肯定猜测，用于百分百的肯定。彳列： Mary must have some problems. She keeps crying.注意：在肯定句中must表示对某事有把握的推测，在否定句中的推测用cant(4) have/has to意为不得不,必须”，有一种被迫的意思。(否定形式:dont/doesnt have to) 例： He wants to go with us, but he has to
4、 take care of his sister.3、may/might 的用法(1)表示允许、请求、常与第一人称，r连用。在May.?句型中，肯定回答用Yes, you cano否定回答用No, you can/mustn.例：May I come in?Yes, you can./ No, you can,t./mustn,t.(2)在肯定句中表示推测。(may比might可能性大)例：She may know the news.(3)表示祝愿，意为“祝二例：May you be happy!4、shall/should 的用法(1) shall在疑问句中，常用于第一人称，Shallwc/
5、Shalll.?句型中，意为“好吗？ ”例：Shall we put off the sports meeting until next month?Yes, please./ No, thank you.(2) shall在肯定句，且主语为第二、第三人称时，表示说话人的命令、警告、强制、允诺等。 例：You shall fail if you waste your time.(3) should用于各种人称,强调义务和责任，意为“应该。should与ought to同义，但语气比ought to更委婉。例：I think children should really learn to res
6、pect their elders5、will/would 的用法(1)当will/would用于疑问句中，常用第二人称连用，表示征求意见或建议。例： Would you please turn down the radio?will表示意愿。例：Turn off the lights when you leave the classroom.Yes, I will.6 had better 的用法意为“最好，没有人称的变化，后面接不带t。的不定式had better do sth.,其否定式为： had better not do sth.7、need的用法(1)作为情态动词，意为“需要”，
7、后面直接加动词原形，无时态、人称和数的变化，其否 定形式为 need not 二 neednt.例：You need come here before 7:00 tomorrow.(否定句)You neednt come here before 7:00 tomorrow.注意：在Need.?句型中，肯定回答用Yes, you must.。否定回答用No, you neednt.例：Need I come here before 7:00 tomorrow?Yes, you must./ No, you neednt(2)作为实意动词，有时态、人称和数的变化，后面加动词不定式to do,其否定
8、形式为 don,t/doesn,t need to do sth.例：(肯定句)She needs to come to the meeting this afternoon.(否定句)She doesnt need to come to the meeting this afternoon.(般疑问句)Does she need to come to the meeting this afternoon?Yes, she does./ No, she doesnt.(3)need doing sth.表示被动。例： This car needs repairing.三.归纳表示推测的情态动词
9、：(1) must表示肯定推测，意为“一定，想必”。(2) can表示推测一般用于疑问句和否定句中，意为“可能:Cant意为“不可能”。(3) may表示肯定推测,意为“可能,也许，可能性may大于might。四.补充扩展(1) “should have +动词过去分词”意为“本应该去做，而实际上没有做某事工例： You should have told me this last night.(2) “should not have +动词过去分词”意为“本不应该去做，却做了某事”。例： You should not have spent all the money on such a foo
10、lish thing.()1.- Will you stay for some more days?-Sorry, I. My mother called to ask me to go back at once, t()2. -Who is singing in the next room? Is it Lucy?-It be her. She has gone to New York.)3.-Will the new iphone cost a lot?-I think so. Apples products are usually expensive.()4. -Mom, must I
11、finish my homework now? -No, you. You may have supper first.()5. -May I take the magazine out of the reading room?-No, you cant. You read it here. It is the rule.()6. As everyone knows, rubbish everywhere.“t throw D.may throw()7. -I think the man over there must be Bob.-It be him. He has to Australi
12、a.“t; gone()8. The room is big enough. It hold 100 people.A.can B.must beC.needD.have to()9.-1 dont care what my teachers think. -Well, you.()10. -Have you decided where to do for your summer vacation?-Not yet. We go to Qingdao. It is a good place for vacation.()11. -Mr. Wang, can I finish my homewo
13、rk tomorrow? -No, you.，t()12. Cars, buses and bikes stop when the traffic lights change to red.()13.1 have my own room in my house, so I do what I want in it.()14. You smoke. You are only 14 and it isnt allowed.()15. -we clean the classroom now?-No, you. You clean it after school.A. Must; neednt; ma
14、yB. Must; mustnt; canC. Shall; cant; mustD. Need; mustnt; may()16. -Whose notebook is this?-It Tom. I saw he used it just now.t belong toC.might be belonged toD.can belong to)17. -How was the youth club last night, Mark?-It was great fun. You come.)18. -Its such a long way! What should I do?-You tak
15、e my car if you want.)19. They play football last Friday because Simon forgot to bring his football here.)20.-Can I tell Peter about the news?- No, I dont want anyone else to know it. You keep it to yourself.()21.- This pair of shoes belong to Jack. He like this kind very much.- It be his. Its too l
16、arge for him.A.can; cant B.may; needntC.must; mustnt D.need; cant()22. -Is Jessica giving us a speech this evening?- No it be her. She to Japan,has been()23. Tm feeling much better now so you call the doctor.()24. -May we leave the classroom now?- No, you, Ydu to leave until the bell rings.“t have t
17、o; are supposed t; arent arent supposed()25. Trees fight air pollution. They are natural air conditioners.)26. -Where are you going this month?- We go to Xiamen, but were not sure.)27.I see your ID card, sir? We have to check your information.A. May B. Must C. Should D. Need)28.-Dad, must we wait until the light becomes green?-Yes, Im afraid we. Thats the traffic rule.()29. -Honey, stay home before I return.-I, mum.()30. Everyone go through the security check (安检)when entering the World ExpoPark.答案：CACBA BAACA ACDAA ACCBA ACDDD CACCC