1、Grammar Focus 情态动词情态动词 may,can,must,need1 may 可能；可以可能；可以 may not 可能不可能不 can 能；可以能；可以 cant 不能；不可能不能；不可能 must 必须；一定必须；一定 mustnt 不准，不允许不准，不允许 need 需要需要 needt 不必，不需要不必，不需要+动词动词()原形原形2(能能)表示能力表示能力 He can speak a little English.Can you fly?表示请求或允许表示请求或允许 Can I help you?表示猜测表示猜测 That can not be our English
2、 teacher,because she has gone to Shanghai.3 表请求时 could语气更委婉，主要用于语气更委婉，主要用于疑问句，不可用于肯定句，答语应用不可用于肯定句，答语应用can.Could I come to see you tomorrow?Yes,you can.（否定答语可用（否定答语可用No,Im afraid not.）表能力时 could 是是 can 的过去式。的过去式。4表示请求或允许表示请求或允许:May I go home，please?以以may（表许可或请求）开头的一般疑问句（表许可或请求）开头的一般疑问句,肯定回答肯定回答用用may，
3、否定回答用，否定回答用mustnt或或cant.表示猜测（可能）表示猜测（可能）:You may be right.No,you _ (可以可以)Yes,you may.might为为may的过去式，的过去式，语气较为婉转客气或更加不肯定。语气较为婉转客气或更加不肯定。You might be right.mustnt/you cant.5 表示推测表示推测“肯定，一定肯定，一定”:表示命令表示命令“必须必须”:You must come early tomorrow They must be at home.The light is on.(必须必须)(禁止禁止)否定时表示否定时表示“禁止禁
4、止”:You mustnt smoke here.6must开头的疑问句，开头的疑问句，其否定回答通常用其否定回答通常用 dont have to 或或neednt。而不用。而不用mustnt -Must I finish my homework first?-Yes,you must.-No,you dont have to/neednt.71.-Must I come before eight oclock?-No,you _.”A.cant B.dont C.mustnt D.neednt2.-Must I finish all the work before I leave?-Yes,
5、you _.”A.must B.can C.mustnt D.neednt83.You _ be quiet when you are in a library.A.may B.can C.will D.must9（表命令）比较比较 You may not smoke here(不可以不可以)语气轻语气轻 You cant smoke here（不能）重（不能）重 You mustnt smoke here（决不可）最重（决不可）最重 10既可以做情态动词既可以做情态动词,也可以做实意动词。也可以做实意动词。情态动词情态动词(need do sth)I need buy a big house
6、.(需要需要)He need drive me home.Need I buy a big house?-Yes,you must.-No,you neednt/dont have to.(不必要不必要)11 实意动词实意动词(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.12had better do sth 意为意为“最好最好”，表示建，表示建议和劝告，否定式为议和劝告，否定式为had better not do sth.，后面跟后面跟动词原
7、形动词原形。You had better go to see a doctor.Youd better not stay here.(最好最好)13(必须必须)have to 表示客观因素表示客观因素We are very glad at the party,but mother is ill,so we have to leave now.must 表示主观因素表示主观因素We must study hard to find a good job for ourselves.(必须必须)141.It rained heavily,so we _ stay at home watching T
8、V 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 153.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 you _ ask D
9、avid to go with you.He is free Aneed Bmay Cmust164.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 176.Johnny,you _ play with the knife,you _ hurt yourself.A.w
10、ont;cant B.mustnt;may C.shouldnt;must D.cant;shouldntB 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 the garden?-_.A.No,you neednt B.Not,please.C.No,you mustnt D.No,you wontB C 199.-Must I drive to his house and
11、pick up the children?No,.A.you shouldnt B.you might not C.you neednt D.you mustntC 10.There is someone knocking at the door.it be Tom?A.can B.must C.should D.ought toA 201.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.neednt212.Could I look at
12、your pictures?Yes,of course you _.A.could B.can C.will D.might3._you pass me a pen?Id like to write down the telephone number.A.Need B.Could C.Must D.Should224.May I go to the cinema,Mum?Certainly.But you _ be back by 11 oclock.A.can B.may C.must D.need235.Susans parents have bought a large house wi
13、th 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;may247.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 2526
