Unit2HealthyEating情态动词（2）高中英语人教版必修三.ppt

Unit 2 Healthy EatingModal Verbs 2 Teaching aims1.To learn some modal verbs:ought to,have to,mustnt and neednt;2.To finish some exercises using modal verbs.ReviewWhat modal verbs have you learned in Unit 1?情态动词的用法情态动词的用法:1.情态动词情态动词没有没有_的变化，情态动的变化，情态动词第三人称单数不加词第三人称单数不加-s。2.情态动词情态动词不能单独使用，情态动词后跟动不能单独使用，情态动词后跟动词词_。人称和数人称和数 原形原形 情态动词的特殊用法情态动词的特殊用法:1.cant help doing sth.2.cant too3.may/might as well4.May you1.Excuseme,_youtellmethewaytotherailwaystation,please?could Test小组抢答小组抢答can/could2._youlikeacupofcoffee?Would could/would3.Thatisanimportantbook.You_keepitwell.must may/must4.Therestaurant_beverygood.Itsalwaysfullofpeople.must must/would5.Youlooktired.You_gotobednow.should can/should6.InChina,manychildren_wearuniformwhentheygotoschool.have to should/have to7.Peter_comewithustonight,butheisntverysureyet.may may/willHow many points have you got?Todaywearegoingtolearnmoreaboutmodalverbs!观看微视频观看微视频 自主学习自主学习1.must表示一种表示一种_观的需要，而观的需要，而haveto表示表示一种一种_观的需要，意思是观的需要，意思是“不得不不得不”。I_attendanimportantmeetingthisafternoon.今天下午我不得不参加一个重要的会议。今天下午我不得不参加一个重要的会议。2.havetohave to 的第三人称单数形式是：的第三人称单数形式是：_ have to 的过去式：的过去式：_must/haveto要点归纳要点归纳主主客客have tohas tohad tomust 用在否定句中mustnt 只有一个意思，禁止You mustnt use cellphone in classroom.You mustnt go out at night.should 和和ought to 都为都为“应该应该”的意思，可的意思，可用于各种人称。用于各种人称。ought to 的语气稍重一些的语气稍重一些,表示表示_观要求观要求,而而should 表示表示_观要求。观要求。You ought to(should)follow your teachers advice.oughttoshouldought to否定形式为：否定形式为：_客客主主ought not to1.need to do sth 需要做某事需要做某事(实义动词实义动词)need do sth 有必要做某事有必要做某事(情态动词情态动词)Ineedtogetupbefore6oclock.NeedIfinishmyhomeworktoday?-No,youneednt.need/donthavetoneed提问：提问：-NeedIfinishtheworktoday?-Yes,_.No,_.youmustyouneednt/donthavetoyoumustmust提问：提问：-Mustwedoitnow?-Yes,_.No,you_.neednt/donthaveto回答回答must提问时，否定用提问时，否定用neednt或或donthaveto.要点扩展要点扩展shouldhavedone本该做本该做却未做却未做shouldnthavedone本不应该本不应该做却做了做却做了-I couldnt sleep last night.-You should have counted sheep.-I did.But I made a mistake and it took me all night to correct it.neednthavedone本不必做本不必做You neednt have driven your car to school.Its only 5 minutes walk.musthavedone 肯定做过肯定做过Mr.Green cant find his wallet.He must have dropped it in the supermarket.一、请用适当的情态动词填空。一、请用适当的情态动词填空。1.Ill_lookaftermysisterathomethisSunday.2.You_gooutsidetoplayasitissnowingheavily.3.Igotuplatethismorning,soI_takeataxitoschool.4.It_haverainedlastnight,forthegroundiswet.Practice havetomustnthadtomusthave to/ought to/must/mustnt/need二、翻译下列句子：二、翻译下列句子：1.明天我必须去医院看我朋友。明天我必须去医院看我朋友。2.你应该比以前更努力。你应该比以前更努力。3.一切都会好的，你不必担心它。一切都会好的，你不必担心它。4.他肯定去过北京了。他肯定去过北京了。5.你能给我一些怎样学好英语的建议吗？你能给我一些怎样学好英语的建议吗？Keys:1.Imust(haveto)goandseemyfriendinhospitaltomorrow.2.Youshould(oughtto)workharderthanbefore.3.Everythingwillbeok.Youneedntworryaboutit.4.HemusthavebeentoBeijing.5.CouldyougivemesomeadviceonhowtolearnEnglishwell?HomeworkFinish the exercise on the paper.Remember the key points learnt today.