情态动词一can_may_must的用法.ppt

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1、一、情态动词can,may,must的用法情态动词后接动词原形;没有人称和数的变化;不能单独作谓语,与后面的动词共同作谓语;其否定形式在后面直接加not。can/cannotmay/maynotmust/mustnotModalverbs情态动词can/cannot1.MarycanspeakEnglish,butshecannotspeakFrench.(VS:beableto)2.Can/CouldIuseyourdictionary?3.Hecan’t/couldn`tbeintheoffice.Isawhimgooutjustnow.may/maynot1.May/Migh

2、tIcomein?2.Shemay/mightbestillwaitingforus.must/mustnot1.Youmustfinishyourhomeworkfirst.(VS:haveto)2.HemustbeAmerican.表示推测、可能性，must>can>could>may>mightneed/neednot1.Weneedtohavearest.2.----NeedIcleanmyclassroomnow?----No,youneedn`t.(VS:don`thaveto)may/must/need的一般疑问句及其回答：1.MayI.........?Yes,yo

3、ucan./Yes,youmust.No,youcan`t.2.MustI.........?Yes,youmust./No,youneedn`t.3.NeedI.........?Yes,youmust./No,youneedn`t.二.haveto的用法表示客观需要“不得不，必须”Imissedthetrain,soIhadtotakeataxi.在疑问句和否定句中，haveto需借助助动词do，Didhehavetodoit?Youdon‘thavetogothere.（不必，不需要）‖needn’t考虑：haveto与must的区别三、hadbetter的用法表示“最好..

4、....”You`dbettergetsomesleep.hadbetter+（not）dosth.nikⅠ.用适当的情态动词填空：。1.Icanplayfootball.__________youswim?2.Don’tworry.You________returnmethisbooktomorrow.3.Mygrandmaisill.You_______talksoloudlyhere.4.Ican’tplaywithyou.I__________finishmyhomeworkfirst.5.I__________getupearlytomorrow.becauseIhave

5、ameeting.6.______________youpleaseopenthewindow?Canmaycan’tmustmustCan9.Nobody___________livewithoutair.10._________hespeakChinese?Yes,alittle.11.Thebook_________bereturnedbeforeSaturday.12.__________Icomein?Yes,please.13.You________giveupsmokingatonce.It’sbadforyourhealth.14.Excuseme.________

6、_Iaskyouaquestion?15.__________youtellmewherethestationis?16._______Ifinishtheworknow?No,you_________.You_______doitthisevening.17.MayIuseyourdictionary?Sorry,you_________.Iamusingitnow.18.Lookattheground.It’sverywet.It_______haverainedlastnight.canCanmustMaymustMayCanMustneedn’tcancan’tmust