2023学年完整公开课版Book3Unit2LearningaboutLanguage

Unit2HealthyeatingLearningaboutLanguage1.Learnthemodalverbs:oughtto/haveto.2.Understandthedifferentusagesofthemodalverbs:hadbetter/should/oughtto,shall/should/oughtto,dare/need,must/haveto3.Developstudents’interestinGrammarLearning.LearningaimsFirstwealthishealth.

Q1:Whatshould/shouldn’t

wedotokeephealthy?Q2:Whatkindoffoodmustweeattobestrong?Q3:Whatoughtwetoeattostayslim?

Q4:Whatmodalverbs

haveyoulearned?Can,could

May,might

Must/havetoNeed,

Dare

Will/wouldShall/should/oughttoLeading-inModalverb(2)一、oughtto

oughtto用于表示“想必会”“应当;应该”(语气较must弱)：1.他们想必现在已到那儿了。

Theyoughttobetherebynow.2.他最好不要抽烟了。Heoughttostopsmoking.

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。注意哦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。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。最弱【辨析】Yououghttohelphimbecauseheisintroublenow.(语气强)Youshouldhavearestafterfinishingyoursports.（一般性建议）Yououghttocallthepolicewhenyoufindsomethingwronginyourhouse.(语气较强)Heshouldtakecareofthebabiestonight.（一般情况）有命令意味1.YououghttohavehelpedhimwithhisEnglish,____?A.won’tyouB.cannotyouC.shouldn’tyouD.wouldn’tyou2.Asasoldier,you____todoastheofficertellsyou.A.oughtB.shallC.shouldD.will【即学即练】CA二、havetohaveto表示客观需要去做的事情，意为“必须，不得不”。有时态、人称和数的变化，其否定形式和疑问形式需要借助助动词do。Ihavetoleaveheralone.（肯定句）我不得不留她一个人。Youdon’thavetobealone.(否定句)你不需要被孤立一人。Hehadtobethereatonce.(过去式)他得立刻赶到那儿。haveto的否定形式为don’thaveto,表示“没有义务或没有必要做某事”，意为“不必”，常可以回答must提问的一般疑问句。而must的否定式mustn’t表示“禁止”。—MustIhandinthepapertomorrow?—No,youneedn’t/don’thaveto.【即学即练】

—Whatdoyouthinkwecandoforouragedparents?—You______doanythingexcepttobewiththemandbeyourself.A.don’thavetoB.oughtn’ttoC.mustn’tD.can’tANeedIdo…?Yes,youmust.No,youneedn’t.情态动词实义动词dare肯：daretodoneed否，疑needn’tdo(don’t)needsth.(don’t)needtodo肯：must,haveto,oughtto,should三.dare&need否，疑，条

darenotdo否,疑don’tdaretododon’tdaredo注意对need问句的回答:—Need

Ifinishtheworktoday?—Yes,__________.No,___________.No,________________.youmustyouneedn’tyoudon’thaveto同mustneedn’t对其他情态动词的回答:

—ShallItellJohnaboutit?—No,you_____________.—Mustwedoitnow?—No,you_____________.(don’thaveto)needn’t(don’thaveto)needn’t【拓展】情态动词+havedone的用法1.musthavedone

表示对过去情况进行肯定的推测，意为“过去一定做过某事”。2.couldhavedone

表示本来过去能够做而实际未做。3.shouldhavedone

表示本来过去应该做而实际未做。4.can(could)not/neverhavedone

表示对过去事情的否定推测，意为“肯定不，绝不可能”。5.needn’thavedone

表示本不必要做某事而实际做了。【高考链接】(2015·天津高考)I

haveworriedbeforeIcametothenewschool,formyclassmateshereareveryfriendlytome.A.mightn’t B.mustn’t C.needn’t D.couldn’t【解题关键】句意:来新学校前我本没有必要担心的,因为这里的同学都对我很友好。needn’thavedonesth.本没有必要做某事。1.Ithoughtyou_____likesomethingtoread,soIhavebroughtyousomebooks.A.mayB.mightC.wouldD.must2.Whereismypen?I____it.A.mightloseB.wouldhavelostC.shouldhavelostD.musthavelostBDClassexercises3.Ididn’thearthephone.I___asleep.A.mustbeB.musthavebeenC.shouldbeD.shouldhavebeen4.—Therewerealreadyfivepeopleinthecar,buttheymanagedtotakemeaswell.—It____acomfortablejourney.A.can’tbeB.shouldn’tbeC.mustn’thavebeenD.couldn’thavebeenBD5.It’sseven.Jack____behereatanymoment.mustB.needC.shouldD.could6.—IsJohncomingbytrain?—Heshould,buthe_____not.Helikesdriving.A.mustB.canC.needD.mayCD7.Ithasbeenannouncedthatcandidates(候选人)______remainintheirseatsuntilallthepapershavebeencollected.A.canB.willC.mayD.shall8.—Iheardhewentskiinglastyear.—It_____truebecausetherewaslittlesnowthere.A.maynotbeB.won’tbeC.couldn’tbeD.mustn’tbeDC9.—Didthetrainarriveintime?—No.It_______twohoursago.A.musthavearrivedB.oughttohavearrivedC.mustarriveD.oughttoarrive10.—MustIdrivetohishouseandpickupthechildren?

—No,________.

A.youshouldn’t

B.youmightnot

C.youneedn’t

D.youmustn’tBC11.Wedidn’tseeTomatthemeetingyesterday.He____it.

A.mustn’thaveattended

B.cannothaveattendedC.needn’thaveattended

D.wouldhavenotattendedBC12.You________suchalongcomposition.Theteacheronlyaskedfor300words.Youhavewritten600words.A.mustn’thavewrittenB.couldn’thavewrittenC.