情态动词讲解课件.ppt
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1、关于情态动词讲解第1页,此课件共45页哦1.1.表能力表能力.could.could 是是cancan的过去式的过去式,表示过去表示过去 2.表示表示“请求请求”“许可许可”(表请求时,口语中常用表请求时,口语中常用could 代替代替 can 使语气更委婉,回答使语气更委婉,回答时用时用can)can 与与could1)Some of us can use the computer now,but we couldnt last year.2)The newly-built theatre can seat 1500 people.1)-Can/Could I use your dictio
2、nary?-Yes,you can.2)You can have my seat.Im going now.3)You can not talk in class.flash第2页,此课件共45页哦3.表示推测,意为表示推测,意为“可能可能”“”“或许或许”,常用于疑问句或否定句,常用于疑问句或否定句 (could 可以用于肯定句中可以用于肯定句中)1)It cant be my father.He is now in England.2)-Can it rain tomorrow?-No,it cant.3)Where can I put my key?4)You could be righ
3、t,but I dont think you are.对过去的可能对过去的可能推测怎么说?推测怎么说?(不可能不可能)5)He cant/couldnt have gone to Beijing,for I saw him just now.第3页,此课件共45页哦can和和be able to的用法区别的用法区别She _sing the song in English.This machine _ make you feel comfortable.1.can的主语是人或物的主语是人或物,be able to的主语是人的主语是人 We_ finish the work soon.I _ s
4、ee the film so far.2.can只用于现在式和过去式只用于现在式和过去式(could)。be able to 可以用可以用 于于各种时态。各种时态。She ran fast so that she _ catch the bus.3.表示成功地做了某事时,只能表示成功地做了某事时,只能was/were able to,不能不能用用could。He _ flee Europe before the war broke out.can/is able to can ll be able to havent been able tocould/was able towas able
5、to第4页,此课件共45页哦may 与与might 表示表示“许可许可”或或“请求请求”,有,有“可以可以”的意思,比的意思,比can正式。正式。口语中常用口语中常用 might 代代 may,表示委婉语气。表示委婉语气。否定回答时常用否定回答时常用“must not”表表“禁止,阻止禁止,阻止”。1)-May/Might I watch TV after supper?-Yes,you may./Yes,please.(No,you mustnt.)2.表示可能性。表示可能性。意为意为“或许,可能或许,可能”常用于肯定句或否定句中常用于肯定句或否定句中。might 比比 may 可能性小。可
6、能性小。1)They may/might be in the library now.2)She may not know the truth.(或许不或许不,可能不,可能不)3)She may/might have gone home.第5页,此课件共45页哦3.may/might well+动词原形动词原形“完全可以,很有可能完全可以,很有可能”You may/might as well go and have a look.5.May you+动词原形动词原形 表表“希望、祝愿希望、祝愿”May you succeed.4.may/might as well+动词原形动词原形“还是还是的
7、好的好”You may well be proud of your son.He is excellent.May you have a good journey!May all your dreams come true!第6页,此课件共45页哦1.A computer _ think for itself;it must be told what to do.A.cant B.couldnt C.may not D.might not2.The fire spread through the hotel very quickly but everyone _ get out.A.had t
8、o B.would C.could D.was able toA D 第7页,此课件共45页哦3.They will _ run this machine on theirown in three months.A.can B.could C.may D.be able to4.That big cinema _ seat 2,000 people.A.can B.should C.ought to D.is able toD A 第8页,此课件共45页哦5.Could I borrow your dictionary?Yes,of course you _.A.might B.will C.
9、can D.should6.Might I watch TV after supper?Yes,you _.A.may B.must C.might D.couldC A 第9页,此课件共45页哦7.Peter _ come with us tonight,but he isnt very sure yet.A.must B.may C.can D.will8.Some people who dont like to talk much are not necessarily shy;they just be quiet people.A.must B.mayC.should D.would
10、9.Liza _ well not want to go on the trip-she hates traveling.(2008全国全国II)A.will B.can C.must D.may BBD第10页,此课件共45页哦may,might,can,could1.They(can not/may not)_ still be out,for the light is on in the house.2.You(cant/arent able to)_ smoke on the bus.3.With luck,tomorrow(can/could)_be a cooler day.4.Y
11、ou(can/might)_ be right,but Im going back to check it.表示许可表示许可cantcould表示猜测表示猜测can not表示猜测表示猜测(不可能不可能)might表示猜测表示猜测第11页,此课件共45页哦will 与与would 2.疑问句中用于第二人称,表疑问句中用于第二人称,表“请求、建议请求、建议”等等 would 比用比用will 委婉,客气些。委婉,客气些。1)Will/Would you(please)lend me your book?2)Would you like a cup of tea?3.will 与与would用于表
12、示主语的意志或意愿。用于表示主语的意志或意愿。will 指现在,而指现在,而 would 指指 过去。过去。1)Ill never do that again.2)They said that they would help us.1.作助动词表单纯的将来作助动词表单纯的将来,可用于各种人称。可用于各种人称。1)I will tell you something important tomorrow.2)He said that he would tell you something important the next day.第12页,此课件共45页哦5.表示习惯性动作。表示习惯性动作。译
13、作译作“总是、惯于总是、惯于”will 指现在,指现在,would 指过去。指过去。1)This old man is strange.He will sit for hours without saying anything.2)She would sit by window,deep in thought.4.表示表示推测推测,译作,译作“会,将会会,将会”Give him the apple.He will like it.6.与与not搭配,表拒绝,无可奈何之意搭配,表拒绝,无可奈何之意1)This door wont open.2)We pushed the car but it w
14、ouldnt move,not a bit.第13页,此课件共45页哦1)Perhaps I shall pay a visit to England this winter.shall 1.作助动词表单纯的将来作助动词表单纯的将来,用于第一人称。用于第一人称。2.在疑问句中,用于提出建议、征求意见。在疑问句中,用于提出建议、征求意见。常用于一常用于一、三人称、三人称.1)Shall we begin our discussion?2)Shall he use your pen?flash第14页,此课件共45页哦3.用于二、三人称,表说话人的允诺,决心,警告,命令用于二、三人称,表说话人的允
15、诺,决心,警告,命令,或威胁。或威胁。1)You shall fail if you dont work harder.2)You shall get what you deserve.3)He shall be punished if he breaks the rule.4)Nothing shall stop us.(警告)(警告)(允诺允诺)(威胁威胁)(决心决心)4.用在条约用在条约、规章规章、法令等文件中表示义务或规定。法令等文件中表示义务或规定。1)Nobody shall go out without the teachers permission.2)Candidates s
16、hall remain in their seats until all the papers have been collected.第15页,此课件共45页哦should 用于表义务、劝告、建议。用于表义务、劝告、建议。意为意为”应该、应当应该、应当”。(也可用(也可用ought to,但但ought to 语气重)语气重)1)You should/ought to help your mother with the housework.2.表示可能性、推测、推论或期待表示可能性、推测、推论或期待,意为意为“可能、按理说、该可能、按理说、该”Its 8 oclock now,he shou
17、ld be here at any moment.2)Dinner should be ready by now.2)One ought not(oughtnt)to cross the street against the red light.3)Ought we to do it at once?Yes,you ought to.第16页,此课件共45页哦3.表示意外或惊讶。意为表示意外或惊讶。意为“竟然会竟然会”1)Its strange that he should be absent.2)It seemed unbelievable that he should have done
18、such a wicked thing.4.表示语气较强的假设。意为表示语气较强的假设。意为“万一万一”If the car should break down on the way,you would have to walk back.第17页,此课件共45页哦1.This printer is of good quality.If it _ break down within the first year,we would repair it at our expense.A.would B.should C.could D.might 2.I dont care what people
19、 think.Well,you _A.could B.would C.should D.might3.What do you mean,there are only ten tickets?There_ be twelve.A.should B.would C.will D.shallBCA第18页,此课件共45页哦4.-What does the sign over there read?-“No person _smoke or carry a lighted cigarette,cigar or pipe in this area.”2007 四川卷Awill Bmay Cshall D
20、.must 5.Whats the name?Khulaifi._ I spell that for you?A.Shall B.Would C.Can D.Might CA第19页,此课件共45页哦must1.表示义务或强烈的劝告,意为表示义务或强烈的劝告,意为“必须必须”“”“应该应该”,其否定式表示其否定式表示“不应该不应该”“”“不许可不许可”“不准不准”“”“禁止禁止”。(回答回答 must 所在的一般疑问句时,否定回答用所在的一般疑问句时,否定回答用 “neednt”“dont have to”.)1)You must finish your homework first.2)Ch
21、ildren mustnt speak like that to their parents.3)-Must we finish the work tomorrow?-No,you neednt/dont have to,but you must finish it in three days.flash第20页,此课件共45页哦 1)Betty must be in the next room.2)He must be joking.3)There is nobody here.They must have gone home.2.must表推测,用于肯定句,意为表推测,用于肯定句,意为“一
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