情态动词

情态动词我们明天能按时去那儿。Wecanbethereontimetomorrow.我能知道你的名字吗？MayIhaveyourname?我们现在就开始吗？Shallwebeginnow?你必须遵守校规。Youmustobeytheschoolrules.`情态动词的定义:情态动词是一种本身有一定的词义,表示说话人的情绪,态度或语气的动词,但不能单独作谓语,只能和其他动词原形构成谓语。情态动词数量不多,但用途广泛,主要有下列:can(could),may(might),must,need,shall(should),will(would).1、Icanseeyou.Comehere.2、Hemustbeaway.3、WhatcanIdoforyou?情态动词的位置:情态动词在句中放在谓语动词之前,谓语动词前若有助动词,则在助动词之前,疑问句中,情态动词则在主语之前。Couldyoutellmethetruth?Wecan‘tcarrytheheavybox.Youmaygonow.Shemaycome.情态动词的特点：1)情态动词无人称和数的变化,2)情态动词后面跟的动词需用原形,3)否定式构成是在情态动词后面加“not”。4)个别情态动词有现在式和过去式两种形式,过去式用来表达更加客气,委婉的语气,时态性不强,可用于过去，现在或将来。Can:1.HecanspeakEnglish.2.Canyouswim?Yes,Ican.No,Ican’t.HeisabletospeakEnglish.Areyouabletoswim?1.能，会=beabletoCanyoupassmethebooks?Youcangonow.Theclassisover，youcangohome.2.说话人许可或请求许可，还可表示客观条件允许。Canitbetrue?HehasgonetoBeijing,sohecan’tcomehere.3.在疑问句,否定句中表示怀疑、不确定；否定的推测。IcouldswimwhenIwas6yearsold.IwasabletoswimwhenIwas6yearsold.Could:1.过去的能力，能，会。2.用于现在和将来时，表示语气委婉，客气，或表示可能性不大。Couldwestartearlier?CouldIhelpyou?Itcouldsnowlaterthisafternoon.May:1.说话人许可或请求许可。Youmaytakeitaway.MayIcomein?Yes,youmay.No,youmaynot.No,youcan’t.Hemayberight.Hemaycometomorrow.Hemaynotcometomorrow.2.表猜测，可能性。HesaidthatImightborrowhisbike.Heaskedifhemightgo.Might:1.may的过去式，可以，许可。MightIborrowyourbike?Hemightberight.2.用于现在和将来时表许可；表猜测，可能性。Youmustcomeontime.Imustfinishmyhomework.Must:1.必须，一定。MustIdoitnow?Yes,youmust.No,youneedn’t.Youmustbetired.He’sveryhappy,hemustsucceed.2.表猜测，一定是，一定会。Hemustn’tgowhenthelightisred.3.禁止，千万别*Youmustdoitnow.你必需现在就干。It’slate,Ihavetogonow.我得走了。(说话人认为必须现在干)(客观条件必须现在走)Hehadtoleaveatthattime.*must只用于一般现在和将来时，其它时态用haveto代替。NeedIgonow?Youneedn’tgonow.Need:用于疑问和否定句，表示需要。*可用做实义动词，+todoDoIneedtogonow?Youdon’tneedtogo.Sheneedstogonow.()1John___cometoseeustonight,butheisn'tverysureyet.A.needB.canC.hastoD.must()2They___dowellintheexam.A.canbeabletoB.beabletoC.canabletoD.areableto()3-MayItakethisbookout?-No,you___.A.can'tB.maynotC.needn'tD.aren'tADA()4You___goandseeadoctoratoncebecauseyou'regotafever.A.canB.mustC.dareD.would()5-CanyouspeakJapanese?-No,I____.A.mustn'tB.can'tC.needn'tD.maynot()6-He___beintheclassroom,Ithink.-No,he___beintheclassroom.Isawhimgohomeaminuteago.A.can;maynotB.must;maynotC.may;can'tD.may;mustn'tBBC2-ShallIgetonemorecakeforyou,Dad?-Thanks,butyou____,I'vehadenough.A.maynotB.mustnotC.can'tD.needn't3Eventhetopstudentsinourclasscan'tworkoutthisproblem,soit____beverydifficult.A.mayB.mustC.canD.need4Heisn'tatschool.Ithinkhe___beill.A.canB.shallC.mustD.hastoDBC1Thechildren___playfootballontheroad.A.can'tB.canC.mustn'tD.must()2You___belateforschoolagainnexttime.A.mustn'tB.needn'tC.don'thavetoD.don'tneedto()3-MustIdomyhomeworkatonce?-No,you___.A.needn'tB.mustn'tC.can'tD.maynotCAA1Hisarmisallright.He___goandseethedoctor.A.hasnottoB.don'thavetoC.haven'ttoD.doesn'thaveto()2Hehadtogiveuptheplan,___he?A.didB.didn'tC.doesD.doesn't()3Theyhadtowalkhere,___they?A.mustn'tB.didC.didn'tD.hadn'tDBC2-Whydon'tyouaskMiketogowithus?-Thanks,___.A.IwillB.Iwon'tC.leanD.Imay3-___Itakethenewspaperaway?-No,youmustn't.You____readitonlyhere.A.Must;canB.May;canC.Need;mustD.Must;must4Excuseme.___youpleasepassmethatcup?A.DoB.ShouldC.WouldD.MustABC3-Wouldyouliketogoboatingwithus?-Yes,___.A.I'dlikeB.IwantC.I'dliketoD.Ido4You___worryaboutyourson.Hewillgetwellsoon.A.needn'tB.can'tC.mustn'tD.havetoAC2Thepoormanneedsourhelp,___he?A.needB.needn'tC.doesD.doesn't3-Mustwedoourhomeworkfirst?-No,you___.Youmayhavearestfirst.A.mustn'tB.needn'tC.maynotD.can'tDB