1、Language points情态动词精讲情态动词精讲一一.can的用法的用法1.表示能力表示能力 Eg:She can swim,but I cant.2.表示请求、允许表示请求、允许，与，与may 意思相近。意思相近。eg:Can I use your pen?3.表示推测表示推测，意为，意为“可能可能”，常用在否，常用在否定句和疑问句中，表推测时，定句和疑问句中，表推测时，cant 意为意为“不可能不可能”eg：The news cant be true.二二.Could 的用法的用法1.Can 的过去式，意为的过去式，意为“能，会能，会”。eg:He could write poems
2、 when he was 10.2.用于疑问句中，表示委婉的语气用于疑问句中，表示委婉的语气。Could I sit here?Could you help me?三三.may 的用法的用法1.表示请求、许可表示请求、许可，比，比can正式。正式。May I borrow your bike?肯定回答：肯定回答：Yes,you can./Yes,please.否定回答：否定回答：No,you cant./No,you mustnt.2.表示推测，表示推测，谈论可能性，意为谈论可能性，意为“可可能，或许能，或许”，一般用于肯定句中。，一般用于肯定句中。It may rain tomorrow.3
3、.May 的过去式为的过去式为might,might表表示推测时，可能性小于示推测时，可能性小于may.eg:He is absent from school.He might be sick.4.表示希望、祈求、祝愿表示希望、祈求、祝愿，可翻译，可翻译为为“祝愿祝愿”，通常用在，通常用在“may+主语主语+动词原形动词原形”结构中。结构中。eg:May you succeed.四四.must 的用法的用法1.表示主观看法表示主观看法，意为，意为“必须，一定必须，一定”eg:Must I clean the room now?2.mustnt 意为意为“一定不要，千万一定不要，千万别，别，”禁
4、止，不许禁止，不许肯定回答：肯定回答：Yes，you nust.否定回答：否定回答：No,you neednt./No,you dont have to.eg:You mustnt run when you meet a bear.3.must 表示有把握的推测表示有把握的推测，用在肯定，用在肯定句中。句中。eg:The light is on,he must be in the room.4.比较比较must 和和 have to五五.Will 的用法的用法Will 表示意愿、意志、打算，表示意愿、意志、打算，意为意为“将，将要，会将，将要，会”。Eg:I will help you if
5、Im free this afternoon.六六.need.need的用法的用法1.实义动词，用于肯定句。常用于结构实义动词，用于肯定句。常用于结构 need to do sth或或need doing sth.eg:You need to have a break.2.情态动词，用于疑问句和否定句中。情态动词，用于疑问句和否定句中。肯定回答：肯定回答：Yes,you must.否定回答：否定回答：No,you neednt./No,you dont have to.eg:Need I stay here any longer?The room needs cleaning.七七.Shall
6、的用法的用法Shall 表示征求对方的意见，多用于表示征求对方的意见，多用于第一人称，第一人称，shall I?Shall we?eg:Shall we go out for a walk?八八.Should 的用法的用法1.Should 意为意为“应该应该”，可表示劝，可表示劝告、建议、义务、责任告、建议、义务、责任 等。等。eg:We should protect the environment.2.*should have done 表示表示“过去本过去本应该做而实际上未做应该做而实际上未做”，含有责备或后，含有责备或后悔的意味。悔的意味。eg:You should have told
7、me about his illness.情态动词专项训练情态动词专项训练1.-Must I come at 6:30 tomorrow?-No,you neednt.You _ come one hour later.A.Can B.need C.should D.must2.-Is that Kates car?-It_ be hers.She has just gone for a meeting.A.cant B.should C.mustnt D.mayAA3.-Bob,where is Linda?-She _ be in the library.But Im not sure.4
8、.-May I take this magazine out of the reading room?-No,you _.You read it here.A.Must B.may C.need D.has toA.mightnt B.wont B.C.neednt D.mustntBD5.-Many people play with mobile phones all day instead of reading books.-Thats too bad.Everyone _ be a book lover.Reading is more enjoyable.A.May B.should C
9、.would6.If you _ smoke,please go outside.A.can B.may C.must D.mightBC7.Honey,stay at home before I return.-I _,mum.A.must B.can C.will D.should 8.Here is my phone number.You _ call me any time you like.A.must B.can C.should D.needCB9.We _ use mobile phones when the plane takes off.A.may not B.should
10、nt C.neednt D.mustnt10.The girl in the classroom _ be Mary,she called me from Beijing just now.A.mustnt B.neednt C.shouldnt D.cantDD11.What does the song NeverSayNever impress you most?-It tells us that we _ do almost anything if we never give up.A.Can B.have to C.should D.needA12.-Mum,_ I visit the Movie Museum tomorrow?-Im afraid you cant.It is closed on Monday.A.must B.may C.should D.need13.Must we stay here waiting for you?-No,you _.A.neednt B cant C.shouldntAB14.If you wish,you _ come in and have a cup of coffee.A.May B.must C.would D.shouldA
