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1、ModalVerbs1hadbettershouldoughttoHadbetterHadbetter是一個(gè)固定詞組，表示可取，意為“最好”，“應(yīng)該”，常用一般式。E.g,You’dbettergetsomerest.We’dbetterstopnow.Youbettersayyesiftheyaskyouthisquestion.(有時(shí)可以省略had)Shouldshould表示義務(wù)，意為“應(yīng)該”或“應(yīng)當(dāng)”。E.gYoushoulddowhatyourparentstellyou.Heshouldlookforajob,buthedoe
2、sn’twantto.HowshouldIknow?Isuggestthatyoushouldstayheretillyourteachercomes.Should（考點(diǎn)1）should用于完成時(shí)中的肯定句，表示應(yīng)完成而未完成的動(dòng)作。E.g,1.Helookssoill.Heshouldhavestayedathome.should用于完成時(shí)中的否定句，表示不應(yīng)完成但已做的動(dòng)作。E.g,1.Theyshouldn’thavelefttheclassroom.1.Withsomuchworkonhand,you____toseethegam
3、elastnight.()mustn’tgoBshouldn’tgoC.couldhavegoneD.shouldn’thavegoneshould標(biāo)推測(cè)時(shí)，暗含可能性很大。Thefilmshouldbeverygoodbecauseithasfirst-classactors.should可用在某些從句中，表虛擬語氣。Isuggestthatyou(should)obeytherulesinyournewcompany.Iadvisethatyoufinishyourhomeworkwithoutanyhelpfromyourclass
4、mates.Should（考點(diǎn)2）oughttooughtto用于表示"想必會(huì)"(語氣較must弱)：1.Theyoughttobetherebynow.他們想必已到那兒了。2.Heoughttostopsmoking.他最好不要抽煙了。多數(shù)情況下，oughtto可與should互換使用。Oughtto的反意疑問句用shouldn’t替代。13.YououghttohavehelpedhimwithhisEnglish,________you?A.won’tyouB.oughtnotyouC.shouldn’tyouD.wouldn’ty
5、ou比較hadbetter,should&oughtto三者均表示建議，意為“應(yīng)該”，“應(yīng)當(dāng)”或“最好做…”.三者的語氣程度為漸強(qiáng)。Hadbetter指一般性的建議，最弱。Should&oughtto含義相近，?？苫Q。區(qū)別在于，oughtto常指特殊情況下的“應(yīng)當(dāng)”。Should則指一般情況。見下頁例句。Yououghttohelphimbecauseheisintroublenow.(語氣強(qiáng)，有命令意味。)Youshouldhavearestafterfinishingyoursports.（一般性建議）Yououghttocallt
6、hepolicewhenyoufindsomethingwronginyourhouse.Heshouldtakecareofthebabiestonight.mustcan/couldmay/mightModalVerbs2must1.表示義務(wù)，意為“必須”。（主觀意志）Wemustdoeverythingstepbystep.Beingastudent,youmusttryyourbesttopasstheexams.Youareanadult,youmusttaketheresponsibilitiestoyourbehaviors
7、.Imustgonowasmyboyfriendiswaitingformeoutside.Must--Mustwehandinourhomeworknow?--No,youneedn’t./No,youdon’thaveto.對(duì)must的問句，肯定回答用must或haveto而否定回答一般不用mustn’t，因?yàn)閙ustn’t表示禁止，用needn’t或don’thaveto，意思是“不必”。Intheclassroom,youmustnotsmoke.--MustIleavenow?--No,youneedn’t./No,youdon
8、’thaveto.must（考點(diǎn)1）2must表示推斷或揣測(cè)。意為“想必，一定，準(zhǔn)是。”且只用于肯定句。Hemustbeill,becausehelookssopale.Youmustbeti
