英语高二英语情态动词用法.pptx

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1、第1页/共34页can&couldmustmay&mightwill&wouldshall&should第2页/共34页1)can的主要用法是：A._：Thegirlcandanceverywell.B._：Canthenewsbetrue?C._:CanIsithere?can&could：表示能力表示推测可能性表请求或允许（多用于疑问否定句中）第3页/共34页2)could的主要用法是：A._:Weallknewthattheyoungmancouldntbeadoctor.我三岁就能看书了。FathersaidIcouldgooutwithmyfriends.could是can的过去式,

2、表示过去的能力,许可和推测B.could可代替can表示请求,语气委婉(主要用于疑问句）Couldyoulendmeyourbike?CouldIuseyourbike?-Yes，youcan.第4页/共34页3)Theycant/couldnthavegoneoutbecausethelightisstillon.cant/couldnthavedone过去否定猜测mustdo/be现肯猜cantdo/be现否猜musthavedone过肯猜第5页/共34页must:1)._Wemustalldie.人总要死的。2)._Youmustgetupearly.你必须早起来。表示必然性。表示强制/

3、义务。第6页/共34页Wemustntwasteourtime.-MayItakethismagazineout?-No,youmustnt.3).mustnot:“禁止”。4).must用于一般疑问句的时候，肯定回答用yes,please或者Imafraidso,其否定回答用neednt或者donthaveto第7页/共34页5).表示推测，意为“一定是”,语气非常肯定，近乎确定的意味，一般用在肯定句。must+v 对现在的推测Itmustbeelevenoclocknow.Hemustgocrazy.must+have+过去分词 对过去的推测must+be+v-ing 对将来或现在进行时的

4、推测6).表示“偏偏”，表达对某事的不满或责备等情绪。WhymustitrainonSunday?第8页/共34页may&might：may常用来表示：A._MayIcomein?Yes,please.B._表示请求、允许;-IbelievethemanisfromEngland.-ButImaybewrong.Theguestmayarrivethisafternoon表示猜测答语避免使用may，以免显得太严肃或太不客气第9页/共34页Theroadmaybeblocked.这条路可能不通了。Theroadcanbeblocked.这条路可能会是不通的。在疑问句中，表示可能性用can。如：W

5、herecanhebe?他会在哪呢？可能性从大到小:must.cancouldmaymight第10页/共34页C._Mayyousucceed!Mayyouhaveagoodjourney!表示祝愿;语气较正式:多在间接引语中表示过去的可能和允许。也可以表示现在的可能性，但是比may表示的可能性更小，且might可以用于虚拟语气，may不可以。might的用法有:Shesaidthathemighttakeherbike.她说他可以拿她的自行车去用。Youmightgetsomehelpfromherifshewerehere.第11页/共34页will&would：1).Iwilltell

6、yousomethingimportant.我将要告诉你一些重要的事。Nancywillsticktoherwayoflife.Itoldhimnottodoit,buthewould.will是助动词或是情态动词用于构成将来时是助动词。用于表“意志/决心”是情态动词。would亦同理，只是表过去。第12页/共34页2)._Ifyouwanthelp,letmeknow,willyou?如果你需要帮助,让我知道,好吗?Wouldyoutypethis,please?请打印这个，好吗？Wontyousitdown?请坐下，好吗？疑问句中用于第二人称，提出请求表委婉不是表过去第13页/共34页Th

7、iswillbethebookyouwant.Hewillhavearrivedbynow.Theguestswouldhavearrivedbythattime.Ithoughtyouwouldhavefinishedthisbynow.Thiswillbethebuildingyouarelookingfor.3).用“willbe”和“will(would)+have+过去分词”的结构表示推测，主要用于第二、三人称。前者表示对目前情况的推测，后者表示对已经完成的动作或事态的推测。第14页/共34页4)._Wouldyouhelpus,please?请您帮助我们，好吗？Idgotherew

8、ithyou.我要和你一块到那儿去。Teacherwouldntallowit.老师不会允许这件事。（表请求）would比will客气委婉。（表意愿）（表许可）第15页/共34页shall&should：1).PerhapsIshallpayavisittoEnglandthiswinter.可能今年冬天我会去英国观光。（构成一般将来时,助动词）shall用于构成将来时是助动词。第16页/共34页（表“决心”，情态动词）Shallwegobytrain,Mom?妈妈，我们乘火车去好吗？Shallhecomein?要他进来吗？2).用于征求意见,是情态动词,一般用于第一一人称和第三人称第17页/

9、共34页（表“决心”，情态动词）Dontworry,youshallgetthebook.Nothingshallstopus.Youshallgetwhatyoudeserve.Heshallbepunishedifhebreakstherule.Nooneshallsmokehere.3).用于表允诺，决心，警告，命令,或颁布法令规定等。用于二三人称。第18页/共34页4).You shouldkeepyourpromise.你应该遵守诺言。Youshouldcallthepolice.*表示“按理说”。Its8oclocknow,heshouldbehereatanymoment.*表埋

10、怨，用于“Shouldnt?”Shouldntyoubedoingyourhomeworknow?should表示义务/建议/劝告，意为“应该”。第19页/共34页1.-_ I go out to play,mum?-No,you_.You should do your homework first.A.Might;wouldnt B.May;had better not C.Must;mustnt D.Need;mustntB第20页/共34页2.-WhereisEmma?-Icantsayforsurewheresheis,butshe_beoutshopping.A.canB.shoul

11、dC.mustD.mayD第21页/共34页3.Theroomisinaterriblemess;it_cleaned.A.canthavebeenB.couldntbeC.mayhavebeenD.wouldbeA第22页/共34页4.How_yousaythatyoureallyunderstandthewholestoryifyouhavecoveredonlypartofthearticle?A.canB.mustC.needD.mayA第23页/共34页5.Whatdoesthesignoverthereread?“Noperson_smokeorcarryalightedcigar

12、ette,cigarorpipeinthisareas.”A.WillB.mayC.shallD.mustC第24页/共34页6.Has Mr.Tom White arrived?Yes,already _he wait outside or just come in?A.Shall B.May C.Could D.MustA第25页/共34页7.-Jane has just come back from China and she looks happy.-She _ her trip very much.A.must enjoy B.must have enjoyedC.may enjoy

13、 D should have enjoyedB第26页/共34页8.Youcantimaginethatawell-behavedgentleman_besorudetoalady.A.mightB.needC.shouldD.wouldC表示惊讶的语气第27页/共34页9.Theterribleaccidentisunderinvestigation.Actually,quickeraction_thoseworkerstrappedinthemine.A.mighthavesavedB.musthavesavedC.shouldhavesavedD.couldhavesavedD第28页/

14、共34页10.He chose to teach in a western province,though he _in the city for a better life.A.could stay B.would stayC.could have stayed D.had stayedC11.We_hereatlunchtime;weweredelayedattheairport,though.A.couldbeB.shouldbeC.musthavebeenD.wouldhavebeenD第29页/共34页12.HowIwishI_mymouthbeforeIshoutedatmyum!

15、A.shutB.haveshutC.hadshutD.wouldshutC13.We must apply what we have learnt to our daily work because in no case _ from practice.A.should theory separate B.should theory be separated C.theory should separateD.theory should be separatedB第30页/共34页14.Whohasmadeamessinmyroom?Whoelse_itbutyournaughtyson?A.

16、coulddoB.couldhavedoneC.shoulddoD.ShouldhavedoneB15.Its really a wonder that all the passengers on board _ while the plane itself sank into the freezing Hudson River in New York.A.must have been savedB.should have been savedC.would be savedD.might be savedB第31页/共34页16.You _ late for yesterday class meeting,as it was so important.A.couldnt be B.shouldnt beC.mustnt have been D.oughtnt to have been17.But for your timely warning,we _into great trouble.You know were friends.A.would get B.must have gotC.would have got D.cant have gotDC第32页/共34页第33页/共34页感谢您的观看！第34页/共34页