1、主讲教师：王克平主讲教师：王克平情态动词情态动词 If you want to cross a street,you must wait for the green light.You mustnt cross in front of the traffic.If the light is yellow,you should wait.If you are not careful,a car may hit you.If you are in the UK,you have to drive on the left.and find out 情态动词,顾名思义是用来表达感情感情和态度态度的动词
2、。表明说话人的立场和口气,以及说话想达到的目的 常用的情态动词有：can(could),may(might),must,have to,need,ought to,shall,should 表能力表能力表推测表推测表请求、允许表请求、允许2013济南-_I help you,sir?-Yes,I want a T-shirt.A Can B Should C Must D Would（2010年北京）-you turn down your radio,please?-Yes,I can.A.May B.Need C.Must D.Can（2009年济南）-Whos that girl swim
3、ming in the pool?Is it Lucy?-It be Lucy.She is sleeping in her bedroom now.A.may B.cant C.must D.should1.表推测表推测2.表请求、允许表请求、允许1.-May I watch TV after supper?-Yes,you may.-No,You may not/cant./Youd better not.No,you mustnt.2.If you are not careful,a car may hit you.可以可以，表示许可，相当于can.(注意问句中的回答）注意问句中的回答）
4、2)可能，或许可能，或许，表示推测 may be 可能1.-May I watch TV after supper?-Yes,you may.-No,You may not/cant./Youd better not.No,you mustnt.(2010年福州)-Dad,must I do my homework now?-No,youplay games with your friends for a little while.A.would B.neednt C.may D.should（2009年广州）I take some photos in the hall?No,you.A.Ca
5、n;neednt B.Must;mustnt C.Could;wont D.May;mustnt1必须，应该You must finish your task before playing games.2表示推测，意为“一定”He must be at home now.3一般疑问句肯定回答用must，否定回答则用neednt或者dont have to.三、must的用法If you want to cross a street,you must wait for the green light.You mustnt cross in front of the traffic.-Must I
6、 be home before 8 oclock?-Yes,you must.-No,you neednt/dont have to.3.There must be something wrong with my computer.must:必须；mustnt:不准，禁止 回答带有must的问句时，否定式常用neednt 或dont have to.3)一定，表示肯定的猜测。（否定猜测用cant）2013泰安28.May I smoke here?-No,you .This is no-smoking room.A.neednt B.mustnt C.couldnt D.wouldntIf y
7、ou are in the UK,you have to drive on the left.The animals we eat have to spend their lives living in tiny spaces.have to 不得不不得不I have to be at work at nine oclock every day.She has to work on Saturdays.Theyll have to stay in a hotel.Does Dick have to go to Beijing on business?He didnt have to go th
8、ere last week.have to+动词原形have to 有人称、数、时态的变化 当主语为第三人称单数时，用has to+动词原形变问句或否定句时，需借助助动词。not have to=needntI have to be at work at nine oclock every day.She has to work on Saturdays.Theyll have to stay in a hotel.Does Dick have to go to Beijing on business?He didnt have to go there last week.I have to
9、be at work at nine oclock every day.She has to work on Saturdays.Theyll have to stay in a hotel.Does Dick have to go to Beijing on business?He didnt have to go there last week.have to+动词原形have to 有人称、数、时态的变化 当主语为第三人称单数时，用has to+动词原形变问句或否定句时，需借助助动词。not have to=neednt 2012北京（）Mum,must I wash the dishe
10、s right now?No,you _.A.shouldntB.wouldntC.mustntD.neednt2013莱芜（）Students in our school _ know shouting is not allowed in the library.A.can B.may C.must D.need2012威海（）Must I learn all these words by heart?No,you _.Itll be fine if you copy them in your exercise books.A.needntB.cant C.shouldnt D.mustnt
11、 两者都表示必须必须 must 侧重于说话者的主观看法，认为有必要或有侧重于说话者的主观看法，认为有必要或有义务去做某事；义务去做某事；have to have to 则重于表示外界客观需要，含有不得不或被迫之意I didnt take the raincoat with me yesterday.I_ wait for my father.A.have to B.has to C.had to D.must 2.Jacks ill,so they _ change their plans.A.must B.should C.have to D.ought to用法一用法一用法二用法二用法三用
12、法三作为实义动词，后加to do.用助动词提问或否定四、need的用法作为情态动词，后加do.用need提问或回答need后加doing表被动意义1.I need type this letter again.我需要重新录入将这封信.2.There is enough time.You neednt hurry.有的是时间，你不必着急。作情态动词作情态动词1).We We needneed a great deal of money now.a great deal of money now.我们需要很多钱。2).They dont They dont needneed it any more
13、 it any more.他们不再需要它了。3).Does your father Does your father needneed any help?any help?你爸爸需要帮助吗?作行为动词作行为动词+n.What do we need to take for the picnic?野餐我们需要带些什么？Will we need to show our passports?我们需要出示护照吗？You need to take good care of your mother.你要好好照料你妈妈 作行为动词作行为动词+to+doneed:需要需要1)作情态动词 He need make
14、 a plan.2)作行为动词（有人称和数变化，后接名词/带to的动词不定式）。He needs to make a plan.1.-Do we need _ for the ticket to the park?-No,we neednt _ that.Its free.to pay,to do B.to pay,do C.pay,to do D.paying,doing2.I dont need _ to school today.A.to go B.go C.going3.Need he _?No.he _.A.to run,neednt.B.run,doesnt need.C.run,
15、neednt4.Will Sam _ tomorrow?A.need to leave B.need leave C.needs to leave can/could1）能，会能，会：表示能力2）可以可以，表示许可3）可能可能，表示推测may/might1)可以可以，表示许可2)可能，或许可能，或许，表示推测must must:必须；mustnt:不准，禁止 回答带有must的问句时，否定式常用neednt 或dont have to.3)一定，表示肯定的猜测。（否定猜测用cant）have to 则重于表示外界客观需要，含有不得不或被迫之意need1)作情态动词2)作行为动词（有人称和数变化
16、，后接名词/带to的动词不定式）注意回答形式注意回答形式：1)May I?Yes,you may.No,you cant(mustnt).2)Must I?Yes,you must.No,you neednt.Can you lend me your MP3?Sorry,I _.My father has taken it with him.A.mustnt B.cant C.neednt D.shouldnt 2.Shall I go and meet you at the airport?No,thanks.I _ take a taxi home.A.need B.must C.shou
17、ld D.can 3.I cant find Dad.Where is he?Im not sure.He _ be in the study.A.must B.may C.need D.will 4.All the passengers _ wear seat belts on the plane.A.can B.may C.will D.must 5._ the exam paper be handed in right now?No,it doesnt have to.You may hand it in before 11:30.A.Can B.Must C.Should D.May
18、6.Must we get to the station before 6:00?No,you _.The train leaves at 9:00.A.mustnt B.neednt C.wont D.cant 7.Mary,_ you speak Chinese?Yes,only a little.A.must B.need C.may D.can 8._ I come in?Sure,come in,please.A.Will B.May C.Must D.Need 9._ I use your mobile phone?Certainly.Here you are.A.May B.Mu
19、st C.Should D.Need May I put my bike here?No,you _.Put it over there please.A.neednt B.wont C.mustnt D.wouldnt11.Having a blog(博客博客)_ help me make more friends.A.can B.must C.need D.should12._I return the book next week?No,you neednt.You can keep it if you like.A.Can B.Must C.May D.Need13.Must I han
20、d in my exercise book after class?No,you _.You may give it to me next Monday.A.mustnt B.neednt C.may not D.cant Must I finish the work in two days,Mr.White?_.A.Yes,you need.B.No,you mustnt.C.No,you neednt D.Yes,you can 15.Mom,_I play computer games?Yes,you can.But you have to finish your homework first.A.must B.may C.will D.need
