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1、Grammar Focus,情态动词 may, can, must, need,1,Grammar Focus 情态动词,may 可能；可以 may not 可能不 can 能；可以 cant 不能；不可能 must 必须；一定 mustnt 不准，不允许 need 需要 needt 不必，不需要,+ 动词 ( ),原形,2,may 可能；可以+ 动词 (,can,(能), 表示能力,He can speak a little English.,Can you fly?, 表示请求或允许,Can I help you?, 表示猜测,That can not be our English tea
2、cher, because she has gone to Shanghai .,3,can(能) 表示能力 He can speak a l,表请求时 could语气更委婉，主要用于疑问句， 不可用于肯定句，答语应用can.,Could I come to see you tomorrow?,Yes, you can. （否定答语可用No, Im afraid not.）,注意,表能力时 could 是 can 的过去式。,4,表请求时 could语气更委婉，主要用于疑问句，Cou,表示请求或允许 :,May I go home，please?,以may（表许可或请求）开头的一般疑问句,肯定
3、回答用may，否定回答用mustnt或cant., 表示猜测（可能） :,You may be right.,No, you _,may,(可以),Yes, you may.,注意,might为may的过去式，语气较为婉转客气或更加不肯定。,You might be right.,might,mustnt / you cant.,5,表示请求或允许 :May I go home，pleas, 表示推测“肯定，一定” :, 表示命令“必须” :,You must come early tomorrow,They must be at home. The light is on.,must,(必须
4、),mustnt,(禁止), 否定时表示 “禁止” :,You mustnt smoke here.,6, 表示推测“肯定，一定” : 表示命令“必须” : Y,注意,must开头的疑问句，其否定回答通常用 dont have to 或neednt 。而不用mustnt,-Must I finish my homework first?,- Yes, you must. - No, you dont have to/ neednt.,7,注意must开头的疑问句， -Must I finis,1.-Must I come before eight oclock? -No, you _.” A.
5、 cant B. dont C. mustnt D. neednt2.-Must I finish all the work before I leave? -Yes, you _ .” A. must B. can C. mustnt D. neednt,D,A,8,1.-Must I come before eight o,3. You _ be quiet when you are in a library. A. may B. can C. will D. must,D,9,3. You _ be quiet when you a,（表命令） 比较, You may not smoke
6、 here(不可以) 语气轻, You cant smoke here（不能）重, You mustnt smoke here（决不可）最重,cant,may not,mustnt,10,（表命令） 比较 You may not smoke,既可以做情态动词, 也可以做实意动词。, 情态动词 (need do sth),I need buy a big house.,need,(需要),He need drive me home.,Need I buy a big house ?,- Yes, you must.- No, you neednt / dont have to. (不必要),11
7、,既可以做情态动词, 也可以做实意动词。 情态动词 (nee, 实意动词 (need to do sth),He needs to buy a big house.,Do I need to buy a big house ?,- Yes, you do. /- No, you dont.,12, 实意动词 (need to do sth) He nee,had better do sth 意为“最好”，表示建议和劝告，否定式为had better not do sth. ，后面跟动词原形。You had better go to see a doctor.Youd better not st
8、ay here.,had better,(最好),13,had better do sth 意为“最好”，表示建,have to,(必须),have to 表示客观因素We are very glad at the party, but mother is ill, so we have to leave now .must 表示主观因素We must study hard to find a good job for ourselves .,must,(必须),14,have to(必须)have to 表示客观因素must(,1. It rained heavily, so we _ st
9、ay at home watching TV all day. A. could B. had to C. must2. May I take the book out of the reading room? No, you cant. You _ read it here. Its the rule. A. must B. would C. may,B,A,练一练,15,1. It rained heavily, so we _,3. Dad, may I watch TV? No. You _ finish your homework first. A. must B. can C. m
10、ay 4. Bob, shall we go and meet our new classmate? Sorry. Im busy now. But you _ ask David to go with you. He is free Aneed Bmay Cmust,A,B,16,3. Dad, may I watch TV?AB16,4. Could I borrow your dictionary? Yes, of course you _. A. might B. will C. can D. should5. You _ return the book now. You can ke
11、ep it till next week if you like. A. cant B. mustnt C. neednt D. may not,C,C,17,4. Could I borrow your dicti,6. Johnny, you _ play with the knife, you _ hurt yourself. A. wont ; cant B. mustnt ; may C. shouldnt ; must D. cant ; shouldnt,B,18,B 18,7. -Will you stay for lunch? -Sorry, _. My brother is
12、 coming to see me. A. I mustnt B. I cant C. I neednt D. I wont8. -May I pick a flower in the garden? - _. A. No, you neednt B. Not, please. C. No, you mustnt D. No, you wont,B,C,19,7. -Will you stay for lunch?B,9. -Must I drive to his house and pick up the children? No, .A. you shouldntB. you might
13、not C. you neednt D. you mustnt,C,10. There is someone knocking at the door. it be Tom? A. can B. must C. should D. ought to,A,20,9. -Must I drive to his house,中考链接,1. Who is the man over there? Is it Mr Li? No, it _ be him. Mr Li is much taller. A. mustnt B. may not C. cant D. neednt,C,21,中考链接1. Wh
14、o is the man over t,2. Could I look at your pictures? Yes, of course you _. A. could B. can C. will D. might,B,3._you pass me a pen? Id like to write down the telephone number. A. Need B. Could C. Must D. Should,B,22,2. Could I look at your pict,4. May I go to the cinema, Mum? Certainly. But you _ b
15、e back by 11 oclock. A. can B. may C. must D. need,C,23,4. May I go to the cinema, M,5. Susans parents have bought a large house with a swimming pool. It _ be very expensive. A. must B. can C. mustnt D. cant6. You _ go and ask Meimei. She _ know the answer. A. must; can B. must; may C. need; can D. can; may,A,D,24,5. Susans parents have bought,7. If you are in the zoo, remember not to touch or go near the animals. Although some of the animals are cute, you _ leave them alone. A. must B. will C. may D. can,A,25,7. If you are in the zoo, reme,26,26,
