初一情态动词语法讲解

Grammar：Modalverbs情态动词情态动词（modalverbs)：表示说话人的语气或情态，如请求、命令、愿望、能力以及可能性等。英语的情态动词有：can/couldmay/mightmustshall/shouldwill/wouldneedhaveto能够可能必须应该意愿敢需要不得不+动词原形肯定否定缩写否定cancannotcan’tcouldcouldnotcouldn’tmaymaynot/mightmightnotmightn’tmustmustnotmustn’tshouldshouldnotshouldn’tneedneednotneedn’tShall一般只能用于第一人称。IshallthinkitoverandLetyouknowmyidea.我将考虑一下此事，然后告诉你我的想法。情态动词不能单独作谓语动词，只能与动词原形一起做谓语，没有人称和数的变化。Abirdcanfly.Fishcan’tlivewithoutwater.Youmusthandinyourhomeworkatonce.Youmustn’ttalkloudlyinpublic.canmaymust词义肯定否定疑问回答能够(表能力)可以(表允许)必须主语+can+动词原形主语+may+动词原形主语+must+动词原形主语+cannot/can’t+动词原形主语+maynot+动词原形主语+mustnot/mustn’t+动词原形Can+主语+动词原形？May+主语+动词原形？Must+主语+动词原形？Yes,主语+can.No,主语+can’t.Yes,主语+may.No,主语+maynot.Yes,主语+must.No,主语+needn’t.在口语中可用can代替，但may更礼貌。1.Myelderbrother______________(能)driveacar.否定句：一般疑问句：肯定回答：否定回答：就划线部分提问：PracticecanMyelderbrothercannot/can’tdriveacar.Canyourelderbrotherdriveacar?Yes,hecan.No,hecan’t.Whatcanyourelderbrotherdo?2.You__________________(可以)leavenow.否定句：一般疑问句：肯定回答：否定回答：就划线部分提问：PracticemayYoumaynotleavenow.MayIleavenow?Yes,youmay.No,youmaynot.WhenmayIleave?3.Lily_________________(必须)gotothelibrary.否定句：一般疑问句：肯定回答：否定回答：就划线部分提问：PracticemustLilymustn’tgotothelibrary.MustLilygotothelibrary?Yes,shemust.No,sheneedn’t.WheremustLilygo?A.用must(not),may(not),can(not)填空：1.—Idon’tunderstandthisword.___________Iuseyourdictionary?--Yes,pleaseuseit.2.Thetrafficlightisturningred.We____________stop.3.You______________borrowtwobooksatatime.4.Tom__________playtabletennis,buthe_________playfootball.5.—Doctor,_____________Itakemuchmedicine?--No,youneedn’t.Butyou______________drinkalotofwater.6.Tomisgoodatdrawing.He______________drawwonderfulpictures.7.You_______________smokehere.It’sdangerous.8.--MayIturnontheTV?–No,you_________.Mydadissleeping.TestYourselfMay/Canmustmay/cancancan’tmustmustcanmustn’t/cannot/maynotmaynotcan’tTestYourselfB.单项选择：1.--_______Iaskyouaquestion?--SureA.MayB.DoC.ShouldD.Am2.—CanIgotothepark,Mum?--Certainly.Butyou________bebackbysixo’clock.A.canB.mayC.willD.must3.____youdance?Weneedsomemoredancersforthetalentshow.A.MayB.CanC.MustD.Should4.I’mafraidIneedapairofglasses.I______hardlyseethewordsontheblackboard.A.canB.mustC.mayD.should5.You________crosstheroadnow.Youhavetowaituntilthelightturnsgreen.A.don’tB.didn’tC.won’tD.mustn’tTestYourself6.—MustIanswerthisquestioninEnglish?--No,you_________.A.mustn’tB.can’tC.needn’tD.shouldn’t7.—Alice,pleasebequiet!Theothers__________hearclearly.A.can’tB.mustn’tC.shouldn’tD.maynot8.IamafraidI__________gowithyou.Iamverybusythesedays.A.maynotB.can’tC.mustn’tD.shouldn’t9.Iamgoingtobed.I_________getupearlytomorrowmorning.A.canB.mustC.shouldD.May10.—MayIsmokehere?--No,you__________onlydothatinthesmokingroom.A.canB.can’tC.mustD.mustn’t