情态动词.docx

1、情态动词情态动词：情态动词没有人称和数的变化，情态动词后必须跟动词原形。A: can 的用法：1.表示能力She can swim fast, but I cant .2.表示推测，“可能”， 用于否定句和疑问句中， cant 译为“ 不可能”。 Can it be our teacher? 那个人有可能是我们老师吗？No, it cant be our teacher. 3. could的用法 1. can的过去式，意为“ 能、 会”，表示过去的能力。 He could write poems when he was 10. 4. could在疑问句中，表示委婉的语气。Could I use

2、 your pen? 我能用一下你的钢笔吗? Yes, you can.可以B: may的用法: 1.表示请求、许可，比can 正式 May I borrow your bike? ( may not ) 2.表示推测“ 可能， 或许”，一般用于肯定句中。It may rain tomorrow .3. may的过去式为might ，表示推测时。可能性低于may。 He is away from school. He might be sick. 4.对 may 引出的问句，回答：Yes,you may. /Of course./Certainly/Sure .No, you may not.

3、 /No, you cant.5.表示希望、祈求、祝愿，常可译为“祝愿”。通常是用may +主+V May you succeed！祝你成功！C: must的用法: 1. 表示主观看法，意为“必须、一定”。You must stay here .2. mustnt表示“禁止, 不许”. You mustnt play with fire. 你不许玩火。 3. 对must的疑问句，肯回must，否回neednt 或 dont have to. Must I finish my homework?No, you neednt.4. must表示有把握的推测，用于肯定句The light is on

4、, so he must be at home.D:need的用法: 1. need 表示需要、必须，用于否定句和疑问句中，2.其否定形式为neednt，意为“没有必要，不必”。3.用need 提问时，肯定回答为 must，否定回答为 neednt或dont have toNeed I stay here any longer? Yes, you must.No. you neednt /dont have to. 4. need 还可以作动词，此时有人称、数和时态的变化，need to do He needs to do it right now. 他需要马上做这件事 E:should的用法

5、:1.should 意为“应该” ，可表示劝告、建议、义务、责任等。 We should wait for the green light .D:shall的用法: shall表示征求对方意见（多用于第一人称) Shall we go out for a walk? 我们出去散步好吗？其回答方式有以下几种： Yes, please.All right.No, thank you.can和may区别:1. can 和 may 均可用来征求意见或许可，意为“可以”， 一般可互换使用。如：Can/ May I help you ? 2. 2.can 和may 表示可能性时的区别：1)在肯定句中用 m

6、ight，may，must，不用can2)在疑问句中表示推测用can，不用 might，may，must3) 在否定句中用cant（不可能）， 不用 may， must。She may be in the classroom . 她可能在教室里。Where can they be now? 他们现在可能在哪儿？That cant be true. 那不可能是真的。 have to do不得不 I/You/They/We/(dont) have to drink water. had to do/ didnt have to do / will have to doHe/She/It/Tom h

7、as to drink water. He/She/It/Tom doesnt have to drink water.had better do最好做某事 Id=I had Shed=She had I/You/They/We/ He/She/It/Tom had better (not) go homeExercise A回答下列问题:(1) I cant find my pen. May I use your pen? _(2) Can you speak loudly in the reading room? _(3) Can you get to school at 8 oclock

8、? _(4) Must we keep our classroom clean? _(5) Need you do morning exercises every day? _ (6) Must you hand in your homework on time? _(7) Can you leave school at three? _(8) Can you eat or drink in class? _(9) May I have a look at your English book? _(10) Can you speak Chinese in an English class? _

9、写出下列否定形式的意思mustnt _ may not_ neednt_ cant_Fill in the blanks with may(not), need(nt), should(nt) in their proper forms.1. She is ill at home. I think you _ help her with her lessons later.2. A: _ I buy film tickets for you? B: No, you _.3. A: _ I ask for leave the day after tomorrow? B: Yes, you _.4

10、. A: Linda, youre poor at maths. You _ study harder. B: OK. Ill do my best.5. You _ not talk in class and you _ listen carefully.6. A: _ I return the book to you today? B: No, you _. You _ keep it till tomorrow.7. A: _ we do more healthy reading after school? B: Yes, you _.8. A: _ I borrow this book

11、? B: Im afraid you _. There is only one copy in the library.9. A: _ we finish homework in class? B: No, you _.Fill in the blanks with may, must, can, cant, should in their proper forms：1. “_ your brother speak English very well, too?” No, he _.”2. “_ you play tennis?” “Yes, I _.”3. The box is very h

12、eavy. Tom _ move it.4. “What about seeing a new film this evening?” “Im afraid I _. I _ finish my English exercises this evening.”5. This fish wont keep fresh, we _ eat it now.6. You _ start now, or youll be late.7. Excuse me, sir. _ I ask you a question, please?Fill in the blanks with mustnt , need

13、nt in their proper forms：1. You _ write to me if you dont have the time.2. You _ hurry. Im sure you wont be late.3. You _ forget to write to me when you arrive there.4. Jane, you _ play with the knife. Its very dangerous.5. Must I get there on time today? No, you _.6. Time is flying. We _ waste our

14、time.7. You _ be afraid of the difficulty. Well give you a helping hand.8. “Must I hand in the maths exercises tomorrow?” -No, you _. You may hand it in the day after tomorrow.9. Tom, you _ read in the sun. Its not good for your eyes.10. You _ worry so much. Im sure hell be well soon.Fill in the bla

15、nks with modal verbs in their proper forms：1. Nobody _ live without air and water2. - _ he speak Chinese? -Yes，a little3. The book _ be returned before Saturday4. - _ I come in? - Yes，please5. _ you tell me where the station is?6. You dont _ worry about herShe is much better now7 If you want to pass

16、 the exam，you _ work harder.8 A: _ I finish my homework now? B: No, you _. You _ do it tomorrow.9. A: This pencil is very short, _ you still use it? B: No, I _. You _ buy one for me.10 A: _ I go out and play basketball, mum?B: No, you _ finish your homework first.11. A: _ I play football in the stre

17、et? B: No, you _.12 A: _ you find many people in the doctors waiting room.B: No, I _.Fill in the blanks with need(to) in their proper forms：1._ I come tomorrow? 明天我需要来吗(need)？Yes, you _ / _. No, you _/ _. 2.He _ worry about his son. (need not)他不必为他的儿子担心。3.He_ some help. (need)他需要一些帮助。4.They _(not ne

18、ed) help.他们不需要帮助.5.Julia _(need)_ (look)after the old man. (need) Julia需要照料这位老人。6.I _(not need) _(get) up early this morning.今天早上我不必早起.7.You need to cross the river by yourself,_ you?8.She didnt need to give you the book,_she?Exercise B_1. -Lets go to Taishan Park by taxi. Its not far. We _ take a t

19、axi. A. neednt B. cant C. mustnt D. couldnt_2.You _ play with fire, Tom. Its very dangerous A. neednt B. may not C. mustnt D. wouldnt_3.As we know, fish _ die out of water. A. may B. is going to C. can D. will_4.Can you answer my question, Lily? Yes, I _. A. may B. need C. must D. can_5.Excuse me, _

20、 you tell me the way to the nearest bus station? -Sorry, I cant. Im a stranger here. A. can B. need C. must D. may_6. -_ I have to show the school report to my parents, Miss King? -Yes, you do. A. Must B. Do C. Can D. May_7. -_ we swim in that river? No, you _. Its dangerous to swim there. A. Must,

21、cant B. Can, may not C. Shall, dont D. May, mustnt_8.After such a long journey, the children _ be very tired now. A. can B. must C. have to D. need_9.Youve made the same mistakes again. You _ be more careful next time. A. can B. may C. had to D. should_10. -_ I fill in the check-in form right now, s

22、ir? -No, you neednt. You can complete it this afternoon. A. May B. Can C. Would D. Must_11.Must I finish reading the book today? -No. You _ if you have something else to do. A. mustnt B. couldnt C. cant D. dont have to_12.You look tired now. You _ stay at home and have a rest. A. had to B. had bette

23、r C. would like to D. neednt _13.Could I look at your pictures? Yes, of course you _. A. could B. can C. will D. might_14.Look at those big black clouds. It _ rain. Lets hurry. A. must B. will C. would D. is going to_15. Would you like to go swimming with me this afternoon? -Id love to. But Im afrai

24、d I _. I have too much work to do.A. cant B. mustnt C. neednt D. may not_16.-_ you like to go shopping with me? Yes, I _.A. Would, would B. Will, will like C. Would, would love D. Would, would love to_17.Must I stay at home, Mum? -No, you _.A. neednt B. mustnt C. dont D. may not_18Can you go swimmin

25、g with us this afternoon? -Sorry, I cant. I _ take care of my little sister at home because my mother is ill.A. can B. may C. would D have to_19.May I stop here? -No, you _. A. mustnt B. might not C. neednt D. wont_20._ I know your name? A. May B. Will C. Shall D. MustExercise C1、Choose the best ans

26、wer:( )1、_ you pass me a pen? Id like to write down the phone number. Sure. Here it is. A. Can B. Need C. Might D. Must( )2.May I go to the cinema, mum? Certainly, but you _ be back by 11 oclock. A. can B. may C. must D. need ( )3.You _ get there by bus. A. dont need B. neednt to C. dont need to D.

27、need dont to( )4.You _ worry about me. Its nothing serious. A. cant B. mustnt C. neednt D. wont( )5.The man in the office_be Mr. Black, because he went home just now. A.mustnt B.may not C.cant D.neednt( )6.John_ come to see us tonight, but he isnt very sure yet. A. may B. can C. has to D. Must( )7 -

28、May I take this book out? -No, you_. A. cant B. may not C. neednt D. arent( )8You_ go and see a doctor at once because youre got a fever. A. can B. must C. neednt D. would( )9 -Can you speak Japanese? -No, I_. A. mustnt B. cant C. neednt D. may not( )10.-He_ be in the classroom, I think. -No, he _ be in the classroom. I saw him go home a minute ago. A. can; may not B. must; may not C. may; cant D. may; mustnt( )11. -Shall I get one more cake for yo