高考英语情态动词.ppt

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1、ModalVerbs1hadbettershouldoughttoHadbetterHadbetter是一个固定词组，表示可取，意为“最好”，“应该”，常用一般式。E.g,You’dbettergetsomerest.We’dbetterstopnow.Youbettersayyesiftheyaskyouthisquestion.(有时可以省略had)Shouldshould表示义务，意为“应该”或“应当”。E.gYoushoulddowhatyourparentstellyou.Heshouldlookforajob,buthedoesn’twant

2、to.HowshouldIknow?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.()mus

3、tn’tgoBshouldn’tgoC.couldhavegoneD.shouldn’thavegoneshould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

4、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

5、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）Yououghttocallthepolicewhenyoufindsomethingwronginyourh

6、ouse.Heshouldtakecareofthebabiestonight.mustcan/couldmay/mightModalVerbs2must1.表示义务，意为“必须”。（主观意志）Wemustdoeverythingstepbystep.Beingastudent,youmusttryyourbesttopasstheexams.Youareanadult,youmusttaketheresponsibilitiestoyourbehaviors.Imustgonowasmyboyfriendiswaitingformeoutside.Mu

7、st--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。Hemu

8、stbeill,becausehelookssopale.Youmustbeti