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1、模块四Unit2情态动词用法讲与练一、推测1.must：一定(1)mustbedoingsth/mustbe+介词短语：Hemustbeintheclassroomnow.musthavedone：一定做过……Thegroundiswet,itmusthaverainedlastnight.(2)must表示推测时,反意疑问句要根据动词的实际时态变化.①Hemustbejoking,isn’the?(原句Heisjoking.)②Theyhavefinishedtheworklastnight,didn’tthey?(
2、原句Theyfinishedtheworklastnight.)③Hisbodymusthavebrokendownbynow,hasn’tit?(原句Hisbodyhasbrokendownbynow.)(3)mustnot/mustn’t:千万别,不要。Youmustn’tsmokeinpublic.2.may/might:可能(用于肯定和否定句)may/might+bedoingsth/介词短语:可能正在……may/mighthavedong:可能做过……maynot/mightnot:可能不Hemightber
3、eadingabooknow.Look,heisveryhappy.Hemayhavepassedtheexam.Theymightnotbeintheroomnow.3.can/could:可能(多用于疑问和否定句,有时也用于肯定句)can/couldhavedone:可能做过……(1)can’t/couldn’t:不可能can/couldn’thavedone:不可能做过……①---Canhehavemissedthebus?---Yes,theymayhave.②Hecan’tbeworkingnow.③They
4、can’thaveagreedtotheplanbynow.(2)could/mighthavedonesth:本来能够做……。Youcould/mighthavecomehereearlier.(3)can/could表示推测时,反意疑问句也根据动词的实际时态变化.Youcan’tbesoserious,areyou?二、许可和请求may/might/can/could:可以(might&could比较委婉)(1)注意问句的回答①---MayIwatchTVnow?---Yes,youcan/may.／No,youc
5、an’t/maynot.(不可以)②Youcancomehere.(2)could表示请求时,多用于疑问句,回答时用can.---CouldIarrangeforyourreturn?---Yes,youcan./No,I’mafraidnot.(3)may/mightaswelldosth:不妨做……。Ifthatisthecase,wemayaswelltry.三、祝愿wishsbsth：Wishyousuccess/goodluck.may+从句（从句中的动词用原形）Mayyousucceed.Longmaysh
6、eremainyoungforever!四、必须、应该、敢1.must和have(got)to(1)must:必须(主观看法)。以must开头的问句,否定回答用needn’t/don’thaveto.---MustIworknow?---Yes,youmust.---No,youneedn’t/don’thaveto.(2)have(got)to:不得不(客观要求,用于各种时态)Ihavetogonow.TheyhadtostayinNanjinglastyear.(3)偏要，一定要Ifyoumustknow,youc
7、angoandaskUncleLiforhelp.2.need(1)modalv.必要,必须(多用于否定和疑问句,后接动词原形)needn’t:不必needn’thavedone:不必做过……①Youneedn’thavegetupsoearlythismorning.②---NeedIgonow?---Yes,youmust.---No,youneedn’t/youdon’thaveto.(2)v.需要sbneedtodosth.Ineedtoreadtheletterfirst.sthneeddoing.Thera
8、dioneedsrepairing.3.should和oughtto两者都表示“应该”，但要反映客观情况或涉及法律、义务和规定时一般用oughtto，因为它语气更强。Should/oughttohavedone:应该做过……Shouldn’t/oughtn’ttohavedone:不应该做过……Youshouldhavebeenm
