高三英语情态动词复习系列三 课件VIP免费

ModalVerbs1•hadbetter•should•oughttoHadbetter•Hadbetter是一个固定词组，表示可取，意为“最好”，“应该”，常用一般式。•E.g,1.You’dbettergetsomerest.2.We’dbetterstopnow.3.Youbettersayyesiftheyaskyouthisquestion.(有时可以省略had)Should•should表示义务，意为“应该”或“应当”。•E.g1.Youshoulddowhatyourparentstellyou.2.Heshouldlookforajob,buthedoesn’twantto.3.HowshouldIknow?4.Isuggestthatyoushouldstayheretillyourteachercomes.Should（考点1）•should用于完成时中的肯定句，表示应完成而未完成的动作。E.g,1.Helookssoill.Heshouldhavestayedathome.•should用于完成时中的否定句，表示不应完成但已做的动作。E.g,1.Theyshouldn’thavelefttheclassroom.1.Withsomuchworkonhand,you____toseethegamelastnight.()A.mustn’tgoBshouldn’tgoC.couldhavegoneD.shouldn’thavegone•should标推测时，暗含可能性很大。Thefilmshouldbeverygoodbecauseithasfirst-classactors.•should可用在某些从句中，表虚拟语气。Isuggestthatyou(should)obeytherulesinyournewcompany.Iadvisethatyoufinishyourhomeworkwithoutanyhelpfromyourclassmates.Should（考点2）oughtto•oughtto用于表示"想必会"(语气较must弱)：1.Theyoughttobetherebynow.他们想必已到那儿了。2.Heoughttostopsmoking.他最好不要抽烟了。•多数情况下，oughtto可与should互换使用。•Oughtto的反意疑问句用shouldn’t替代。13.YououghttohavehelpedhimwithhisEnglish,________you?A.won’tyouB.oughtnotyouC.shouldn’tyouD.wouldn’tyou比较hadbetter,should&oughtto•三者均表示建议，意为“应该”，“应当”或“最好做…”.•三者的语气程度为渐强。•Hadbetter指一般性的建议，最弱。•Should&oughtto含义相近，常可互换。区别在于，oughtto常指特殊情况下的“应当”。Should则指一般情况。见下页例句。•Yououghttohelphimbecauseheisintroublenow.(语气强，有命令意味。)•Youshouldhavearestafterfinishingyoursports.（一般性建议）•Yououghttocallthepolicewhenyoufindsomethingwronginyourhouse.•Heshouldtakecareofthebabiestonight.•must•can/could•may/mightModalVerbs2•must•1.表示义务，意为“必须”。（主观意志）•Wemustdoeverythingstepbystep.•Beingastudent,youmusttryyourbesttopasstheexams.•Youareanadult,youmusttaketheresponsibilitiestoyourbehaviors.•Imustgonowasmyboyfriendiswaitingformeoutside.Must--Mustwehandinourhomeworknow?--No,youneedn’t./No,youdon’thaveto.•对must的问句，肯定回答用must或haveto而否定回答一般不用mustn’t，因为mustn’t表示禁止，用needn’t或don’thaveto，意思是“不必”。Intheclassroom,youmustnotsmoke.--MustIleavenow?--No,youneedn’t./No,youdon’thaveto.must（考点1）•2must表示推断或揣测。意为“想必，一定，准是。”且只用于肯定句。•Hemustbeill,becausehelookssopale.•Youmustbetiredafteryourlongwalking.•Look!Heisdrivingsuchagoodcar,hemusthaveearnedalargeamountofmoneyabroad.•Itmusthaverainedlastnight,forthegroundiswet.must（考点2）Haveto•haveto表示客观需要去做的事情，意为“必须，不得不。”•Ihavetogetthestationearlytocatchthefirsttrain.•Wemissedthebussowehadtowalkhome.•Wehavetoovercomeallkindsofdifficulties.•Haveto有多种时态。常见的有：一般将来时，•Wewillhavetogatherattheschoolgateat7tomorrow.•一般现在时•Ihavetotakemoremoneywithmebecausemygfhassomuchtobuy.•一般过去时•Finally,wehadtogiveupourideatoholdapicnicoutsideasitrainedforawholeafternoon.Haveto（考点）•must表主观意志，而haveto表由于客观因素不得不做完成的事情。•Must没有过去式，除在间接引语中可表示过去的时间。在直接引语中表示过去的时间用hadto代替。•Itoldherthatshemustgiveupsmoking.•Shesaid,“Wehadtogeteverythingreadythatnight.”比...