高一英语情态动词的用法

1、Grammar,课标人教实验版高一Module3Unit1,情态动词用法,1)can的主要用法是：A._：eg.Thegirlcandanceverywell.B._：eg.Canthenewsbetrue?C._:eg.CanIsithere?,can和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）,其他用法：表示请求，命令，惊讶，不相信等。Canyouhelpmetoliftit,please?Ifyouwontkeepquiet,youcangetout!Youcantbeserious!,2)could的主要用法是：A._:eg.Weallknewthat

2、theyoungmancouldntbeadoctor.我三岁就能看书了。FathersaidIcouldgooutwithmyfriends.,could是can的过去式,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,eg.Couldyoulendmeyourbike?CouldIuseyourbike?-Yes，youcan,3表示现在的可能与能力，可能性要小。Whatsfordinner?Icouldeatahorse.Mywifeisinhospital.Ourbabycouldarriveatanytime.4表轻微的责备。Youcouldbemoreca

3、reful.,5)eg.Theycant/couldnthavegoneoutbecausethelightisstillon.,cant/couldnthavedone过否猜,mustdo/be现肯猜cantdo/be现否猜musthavedone过肯猜,must表示推测，语气非常肯定，近乎确定的意味，一般用在肯定句。如：Itmustbeelevenoclocknow.Hemustgocrazy.IfMarydidntleavehereuntilfiveoclock,shecantbehomeyet.如果玛丽五点才离开这儿，他此时一定还未到家。,may和might：may常用来表示：A._e

4、g.MayIcomein?Yes,please.B._,表示请求、允许;比can正式:,eg.-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,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：Wherecanhebe?他会在哪呢？,可能性从大到小:must.cancouldmaymight,C._eg.Mayyousucceed!M

5、ayyouhaveagoodjourney!,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.,will和would：,1.Iwilltellyousomethingimportant.我将要告诉你一些重要的事,WillyoutellherthatImhere?请您告诉她说我在这儿，好吗?Itol

6、dhimnottodoit,buthewould.,（助动词）,（情态动词）,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/请求”是情态动词。would亦同理，只是表过去。,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,3._Wouldyouhelpus,please?请您帮助我们，好吗？Idgotherewithyou.我要和你一块到那儿去。Teach

7、erwouldntallowit.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）,shall和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。,（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,一般用于第一人称和第三人称,（表“决心”，情态动词）,Dontworrt,youshallgettheb

8、ook.Nothingshallstopus.Youshallgetwhatyoudeserve.Heshallbepunishedifhebreakstherule.Nooneshallsmokehere.,2.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。,3.eg:Youshouldkeepyourpromise.你应该遵守诺言。Youshouldcallthepolice.*表示“按理说”。Its8oclocknow,heshouldbehereatanymoment.*表埋怨，用于“Shouldnt?”Shouldntyoubedoingyourhomeworknow

9、?,should表示义务/建议/劝告，意为“应该”。,must的主要用法：,1._eg:Wemustalldie.人总要死的。2._eg:Youmustgetupearly.你必须早起来。,表示必然性。,表示强制/义务。,如：Wemustntwasteourtime.-MayItakethismagazineout?-No,youmustnt.,注意:mustnot:“禁止”。,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,表示推测，意为“一定是”。must+v对现在的推测must+have+过去分词对过

10、去的推测must+be+v-ing对将来或现在进行时的推测表示“偏偏”，表达对某事的不满或责备等情绪。WhymustitrainonSunday?,-_Igoouttoplay,mum?-No,you_.Youshoulddoyourhomeworkfirst.A.Might;wouldntB.May;hadbetternotC.Must;mustntD.Need;mustnt,B,2.-WhereisEmma?-Icantsayforsurewheresheis,butshe_beoutshopping.A.canB.shouldC.mustD.may,D,3.Theroomisinater

11、riblemess;it_cleaned.A.canthavebeenB.couldntbeC.mayhavebeenD.wouldbe,A,4.How_yousaythatyoureallyunderstandthewholestoryifyouhavecoveredonlypartofthearticle?A.canB.mustC.needD.may,A,5.There_beanydifficultyaboutpassingtheroadtestsinceyouhavepractisedalotinthedrivingschool.A.mustntB.shantC.shouldntD.neednt,C,6.-JanehasjustcomebackfromChinaandshelookshappy.-She_hertripverymuch.mustenjoyB.musthaveenjoyedC.mayenjoyDshouldhaveenjoyed,B,WhencanIcomeforthephotos?Ineedthemtomorrowafternoon.They_bereadyby12:00.A.canB.shouldC.mightD.need,B,Youcantimaginethatawel