1、Grammar Focus 情態(tài)動(dòng)詞 may, can, must, need1Grammar Focus 情態(tài)動(dòng)詞 may 可能；可以 may not 可能不 can 能；可以 cant 不能；不可能 must 必須；一定 mustnt 不準(zhǔn)，不允許 need 需要 needt 不必，不需要+ 動(dòng)詞 ( )原形2 may 可能；可以+ 動(dòng)詞 ( can(能) 表示能力 He can speak a little English. Can you fly? 表示請(qǐng)求或允許 Can I help you? 表示猜測(cè) That can not be our English teacher, bec

2、ause she has gone to Shanghai .3can(能) 表示能力 He can speak a l 表請(qǐng)求時(shí) could語(yǔ)氣更委婉，主要用于疑問(wèn)句， 不可用于肯定句，答語(yǔ)應(yīng)用can.Could I come to see you tomorrow? Yes, you can. （否定答語(yǔ)可用No, Im afraid not.） 注意 表能力時(shí) could 是 can 的過(guò)去式。 4 表請(qǐng)求時(shí) could語(yǔ)氣更委婉，主要用于疑問(wèn)句，Cou表示請(qǐng)求或允許 :May I go home，please? 以may（表許可或請(qǐng)求）開(kāi)頭的一般疑問(wèn)句,肯定回答用may，否定回答用mu

3、stnt或cant. 表示猜測(cè)（可能） :You may be right. No, you _ may(可以)Yes, you may.注意might為may的過(guò)去式，語(yǔ)氣較為婉轉(zhuǎn)客氣或更加不肯定。 You might be right. mightmustnt / you cant.5表示請(qǐng)求或允許 :May I go home，pleas 表示推測(cè)“肯定，一定” : 表示命令“必須” : You must come early tomorrow They must be at home. The light is on. must(必須)mustnt(禁止) 否定時(shí)表示 “禁止” :Yo

4、u mustnt smoke here. 6 表示推測(cè)“肯定，一定” : 表示命令“必須” : Y注意must開(kāi)頭的疑問(wèn)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開(kāi)頭的疑問(wèn)句， -Must I finis1.-Must I come before eight oclock? -No, you _.” A. cant B. dont C. mustnt D. neednt2.

5、-Must I finish all the work before I leave? -Yes, you _ .” A. must B. can C. mustnt D. needntDA81.-Must I come before eight o3. You _ be quiet when you are in a library. A. may B. can C. will D. mustD93. You _ be quiet when you a（表命令） 比較 You may not smoke here(不可以) 語(yǔ)氣輕 You cant smoke here（不能）重 You m

6、ustnt smoke here（決不可）最重 cantmay notmustnt10（表命令） 比較 You may not smoke既可以做情態(tài)動(dòng)詞, 也可以做實(shí)意動(dòng)詞。 情態(tài)動(dòng)詞 (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既可以做情態(tài)動(dòng)詞, 也可以做實(shí)意動(dòng)詞。 情態(tài)動(dòng)詞 (nee 實(shí)意動(dòng)詞 (need to do sth) He n

7、eeds to buy a big house. Do I need to buy a big house ? - Yes, you do. /- No, you dont. 12 實(shí)意動(dòng)詞 (need to do sth) He neehad better do sth 意為“最好”，表示建議和勸告，否定式為had better not do sth. ，后面跟動(dòng)詞原形。You had better go to see a doctor.Youd better not stay here.had better(最好)13had better do sth 意為“最好”，表示建have to(

8、必須)have to 表示客觀因素We are very glad at the party, but mother is ill, so we have to leave now .must 表示主觀因素We must study hard to find a good job for ourselves .must(必須)14have to(必須)have to 表示客觀因素must(1. It rained heavily, so we _ stay at home watching TV all day. A. could B. had to C. must2. May I take

9、the book out of the reading room? No, you cant. You _ read it here. Its the rule. A. must B. would C. may BA練一練151. It rained heavily, so we _3. Dad, may I watch TV? No. You _ finish your homework first. A. must B. can C. may 4. Bob, shall we go and meet our new classmate? Sorry. Im busy now. But yo

10、u _ ask David to go with you. He is free Aneed Bmay CmustAB163. Dad, may I watch TV?AB164. Could I borrow your dictionary? Yes, of course you _. A. might B. will C. can D. should5. You _ return the book now. You can keep it till next week if you like. A. cant B. mustnt C. neednt D. may notC C 174. C

11、ould I borrow your dicti6. Johnny, you _ play with the knife, you _ hurt yourself. A. wont ; cant B. mustnt ; may C. shouldnt ; must D. cant ; shouldntB 18B 187. -Will you stay for lunch? -Sorry, _. My brother is coming to see me. A. I mustnt B. I cant C. I neednt D. I wont8. -May I pick a flower in

12、 the garden? - _. A. No, you neednt B. Not, please. C. No, you mustnt D. No, you wontB C 197. -Will you stay for lunch?B9. -Must I drive to his house and pick up the children? No, .A. you shouldntB. you might not C. you neednt D. you mustntC 10. There is someone knocking at the door. it be Tom? A. c

13、an B. must C. should D. ought toA 209. -Must I drive to his house中考鏈接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. needntC21中考鏈接1. Who is the man over t2. Could I look at your pictures? Yes, of course you _. A. could B. can C. will

14、D. mightB3._you pass me a pen? Id like to write down the telephone number. A. Need B. Could C. Must D. ShouldB222. Could I look at your pict4. May I go to the cinema, Mum? Certainly. But you _ be back by 11 oclock. A. can B. may C. must D. needC234. May I go to the cinema, M5. 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; mayAD24