语法专练之情态动词.ppt

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1、I.can/could表否定的猜测can’t/couldn’tdo现在或将来不可能…e.g.Hecan’t/couldn’tbeherfather;he’stooyoung.can’t/couldn’tbedoing现在不可能正在…e.g.Hecan’t/couldn’tbewaitingforusatthestop.can’t/couldn’thavedone（过去）不可能…e.g.Ican’t/couldn’thavelostmykeys.Ineverdropthings.Shecan’thavecaughtthe9:10

2、train,forsheonlyleftherhouseat9:15.比较：--MayIseethesecretary?--Try.Butshemaynotwanttoseeanyone.can/could用在疑问句中表猜测e.g.Can/CoulditbeJohn?Couldthebankhavemadeamistake?e.g.Thispenlooksmine,yetitisn’t.Whosecan/coulditbe?（可能）会是谁的呢？Wherecanshehavegone?couldhavedone过去能够做某事而没

3、做e.g.Hewentonfoot,buthecouldhavetakenabus.e.g.Iwasfiveminuteslate,otherwiseIcouldhavecaughtthetrain.Practice:Icouldhavefinisheditbetter,butI_____noenoughtime.wouldhaveB.haveC.hadD.hadhadii.may/mightmay/might表肯定的猜测（语气较弱）may/mightdo现在或未来可能发生e.g.—Whyisn’tJohninclass?—I

4、don’tknow.Hemay/mightbesick.—Whatareyougoingtodotonight?—Ihaven’tmadeupmymindyet.Imay/mightgotothelibraryorImay/mightjuststayathome.may/mightbedoing现在可能正在…e.g.Myfatherisnothere.Hemay/mightbeworkinginthegarden.将来可能会…e.g.Theymay/mightbewaitingatthestationwhenwearrive.

5、may/mighthavedone过去可能发生e.g.Helooksunhappy.Hemay/mighthavefailedintheexamination.mighthavedone过去可能发生某事但未发生e.g.Youwerestupidtotryclimbingupthere.Youmighthavekilledyourself.e.g.Itisagoodthingyoudidn’tlendhimthemoney.Youmightneverhavegotitback.may用于目的/让步状语从句中，表示可以或可能e.g

6、.Weworkhardthatwemayliveincomfort.e.g.Whatevermayhappen(=Whateverhappens),itdoesn’tconcernus.iii.mustmust表肯定的猜测mustdo现在一定会e.g.Hemustknowherphonenumber.Hehashadnosleepfor48hours.Hemustbeexhausted.mustbedong现在一定正在或即将发生e.g.Itmustberainingnow.Hemustbearrivingtonight.mus

7、thavedone猜测(过去)一定已经发生e.g.Theymusthaveleft,fornobodyisin.Youwereontime.Youmusthavegotupearlythatmorning.musthavebeendoing当时一定正在e.g.Marywasn’tathomewhenwewenttovisither.Shemusthavebeenstudyingatthelibrary.Notice:反意疑问句Hemustberich,Youmusthavehisnumber,Theyarenotadmitte

8、dtothecinema.Hemusthavelosttheirtickets,TheymusthavemetJohnonthewayhomeyesterday,Iknockedatthedoor,butnobodyanswered.Hemusthavebeenasleep,