M3U2 Healthy eating Grammar人教版必修三第二单元语法点.ppt

《M3U2 Healthy eating Grammar人教版必修三第二单元语法点.ppt》由会员分享，可在线阅读，更多相关《M3U2 Healthy eating Grammar人教版必修三第二单元语法点.ppt（36页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

1、TolearntheuseofmodalverbsUnderline the sentences containing modal verbs in the reading passage and use the function words below to explain the meaning of the modal verbs.Intention Duty Permission Possibility Guessing Abilitypossibilitypossibilitypossibilityguessingpossibilityintentionabilitydutyinte

2、ntiondutypossibilitypossibilityabilityModalverbsareusedtoexpressthespeakersmeaningofintention,duty,permission,guessing,ability,etc.1.should和和oughttoa.should,oughtto都可表示都可表示“应该应该”。oughtto用于表示按道理应当，常指客观用于表示按道理应当，常指客观的义务或责任，大多数情况下可用的义务或责任，大多数情况下可用should代替，但比代替，但比should语气重。语气重。e.g.Ishouldhelpherbecauses

3、heisintrouble.Yououghttotakecareofthebaby.b.表示劝告、建议或命令时，表示劝告、建议或命令时，should和和oughtto可通用，但在疑问句中常用可通用，但在疑问句中常用should。oughtto的否定式为的否定式为oughtntto或或oughtnotto。e.g.Youshould/oughttogotoclassrightaway._Iopenthewindow?我可以开窗吗？我可以开窗吗？Whatshouldwedonext?ShouldYououghtnt/oughtnotto(oughtto)leaveinsuchahurry.你不应该

4、离开的这么匆忙。你不应该离开的这么匆忙。c.should,oughtto都可表示推测。都可表示推测。e.g.Heoughtto/shouldbehomebynow.Thisiswheretheoiloughtto/shouldbe.should和和oughtto后面跟动词不定式的完成式后面跟动词不定式的完成式,其肯定句表示其肯定句表示“过去应该做而未做过去应该做而未做”,其否其否定句则表示定句则表示“过去不该做但做了过去不该做但做了”。You_thedecisionaweekago.你应该在一周前就做决定。你应该在一周前就做决定。I_suchafoolishmistake.我不应该犯这样愚蠢的

5、错误。我不应该犯这样愚蠢的错误。多数情况下，多数情况下，oughtto可与可与should互换使用。互换使用。oughtto的反意疑问句用的反意疑问句用shouldnt替代。替代。should/oughttohavemadeshouldnthavemadeYououghttohavehelpedhimwithhisEnglish,_?A.wontyouB.oughtnotyouC.shouldntyouD.wouldntyou2.must和和havetomust的用法的用法1)表示主观的义务和必要表示主观的义务和必要,主要用于肯定主要用于肯定句和疑问句句和疑问句,意为意为“必须必须，得得，要，

6、要”；由；由must引起的疑引起的疑问句，问句，肯定回答肯定回答要用要用must或或haveto,否定回答否定回答要用要用neednt,donthaveto,意意思是思是“不必不必”。must的否定形式的否定形式mustnt表示禁止，意思是表示禁止，意思是“不能，不许不能，不许”。如：。如：MustIfinishthetaskrightnow?我现在必须完成这个工作吗？我现在必须完成这个工作吗？Yes,youmust./Yes,youhaveto.是的。是的。(No,you_./No,youdonthaveto.不，不必。不，不必。)Youmustntcomeherewithoutpermis

7、sion.未经允许，你不能来这儿。未经允许，你不能来这儿。neednthaveto的用法的用法1)must表示一种主观的需要，而表示一种主观的需要，而haveto表示表示一种客观的需要，意思是一种客观的需要，意思是“不得不不得不”。如：。如：Ihavetoattendanimportantmeetingthisafternoon.今天下午我必须要参加一个重要的会议。今天下午我必须要参加一个重要的会议。Motherisout,soIhavetolookaftertheshop.妈妈不在家，因此我不得不照看商店。妈妈不在家，因此我不得不照看商店。2)haveto的否定形式是的否定形式是dontha

8、veto,相当相当于于neednt。如：如：Theydonthavetobuyacomputeratpresent.他们目前没有必要买电脑。他们目前没有必要买电脑。haveto的第三人称单数形式是的第三人称单数形式是hasto，一般，一般过去式是过去式是hadto，一般将来式是，一般将来式是willhaveto。e.g.LiHuahastopassanexaminationbeforehecanstartwork.Mycarwasbroken,soIhadtowalkhome.ItllhavetobeonaSunday.Illbeworkingeveryotherday.Thebosshasg

9、iveneveryoneaspecialholiday,sowe_gotoworktomorrow.A.cantB.mustntC.needntD.shouldnt【点拨点拨】考查情态动词。根据题意考查情态动词。根据题意,可知这可知这里表示里表示“没有必要没有必要”,故只能选故只能选C项。项。Whatdoyouthinkwecandoforouragedparents?You_doanythingexcepttobewiththemandbeyourself.A.donthavetoB.oughtnttoC.mustntD.cant【点拨点拨】根据题意根据题意“除了和他们呆在一起除了和他们呆在

10、一起做你自己外做你自己外,没有必要做任何事情。没有必要做任何事情。”可可知这里选择知这里选择donthaveto表示表示“不必不必”。故选故选A项。项。3.must和和needa.need作情态动词时作情态动词时,只能用于疑问句和否只能用于疑问句和否定句。构成否定句和疑问句时不借助于定句。构成否定句和疑问句时不借助于助动词助动词do。NeedIfinishtheworktoday?Yes,youmust./No,youneednt.b.must的肯定形式表示的肯定形式表示“必须必须”，否定式，否定式表示表示“禁止、严禁禁止、严禁”。Youmustcomehere.Youmustnttaketh

11、ebookawayfromthelibrary.Choose suitable modal verbs below to complete the following dialogues.ought/oughtnttoshould/shouldntwillmustntneednt(dont)havetocan/cant1.Sam:HowcanIgrowthinner,Mum?Mum:Well,you_eatfoodwithplentyoffibrethathelpsyoudigestbetter.Andyou_stopdrinkingcolaoreatingsweetfood.havetosh

12、ouldSam:DoesitmeanI_eatmyfavouritefriedchickenanymore?Mum:Notexactly,ifyoulovefriedchicken,you_giveitup.Justeatitlessoften.You_worrytoomuch:alittlefriedchicken_doyougood!shouldntneedntdonthaveto/neednt/shouldntwillought/oughtnttoshould/shouldntwillmustntneednt(dont)havetocan/cant2.Doctor:Youaresickb

13、ecauseyouveeatenpoisonousmushrooms.Wheredidyougetthem?Lucy:Ipickedthemintheforest.Iknowwe_eatfreshvegetables.Doctor:Oh,butyou_eatthemuntilyouresuretheyarenotpoisonous.Lucy:Thankyou,doctor.Illbemorecarefulnexttime.havetomustntought/oughtnttoshould/shouldntwillmustntneednt(dont)havetocan/cant3.Charles

14、:IwishIcouldseethingsclearlyinthedark.Tom:Eatingcarrots_helpyouseebetter.You_eatsomeeveryday.oughttoshouldought/oughtnttoshould/shouldntwillmustntneednt(dont)havetocan/cant1.Samuel,thetallestboyinourclass,_(can/should)easilyreachthebooksonthetopshelf.（北京（北京2017）2.Myroomisamess,butI_(neednt/mustnt)cl

15、eanitbeforeIgoouttonight.Icandoitinthemorning.（天津（天津2017）选用括号内合适的内容填空。选用括号内合适的内容填空。needntcan3.Ilovetheweekend,becauseI_(neednt,mustnt)getupearlyonSaturdaysandSundays.(北京北京2016)4.Itwasreallyannoying;I_(couldnt,shouldnt)getaccesstothedatabankyouhadrecommended.(天津天津2016)needntcouldnt5.George_(mustnt,ca

16、nt)havegonetoofar.Hiscoffeeisstillwarm.(浙江浙江2016)6.I_(neednt,couldnt)haveworriedbeforeIcametothenewschool,formyclassmateshereareveryfriendlytome.(天津天津2015)needntcant.用用oughtto,oughtnotto,haveto,donthaveto,mustnt,neednt填空。填空。1.You_goacrosstheroadwhenthetrafficlightisonred.2.You_buyagift,butyoucanifyo

17、uwantto.3.Asstudents,we_putmoreenergiesintostudy.4.He_workovertimeinordertofinishthetaskbeforethisSaturday.mustnt/oughtnottoneednt/donthavetooughttohasto5.Tom_havetoldmeyoursecret,buthemeantnoharm.6.Thesunisshiningbrightlyinacloudlesssky;it_beafinedaytoday.7.Youdontlookwell.You_gotoseethedoctor.8.Ad

18、ograninfrontofmymotherscarandmymother_stopveryquickly.oughtnottooughttooughttohadto1.I_(得接受得接受)your2.suggestion.3.2.You_(你不能来这儿你不能来这儿)4.withoutpermission.5.3.You_(应当去照顾应当去照顾)6.yourbrother.4.Ithinkyou_(应当去应当去看看)thedoctor.II.Translatethefollowingsentences.havetoacceptmustntcomehereshouldtakecareofough

19、ttogotosee5.Theteachertoldthestudentsthatthey_(不应该在课堂上沉默不语不应该在课堂上沉默不语)allthetime.6.You_(就得不到就得不到我的支持我的支持)ifyoudosuchathing.7.Iwaitedforthetrainfortwohoursatthestationthismorning.Well,you_(本来没有必要那么早去的本来没有必要那么早去的).8.“You_(你千万不你千万不要再喝酒了要再喝酒了),”thedoctorwarnedhim.mustntdrinkanymoreoughtnotto/shouldntkee

20、psilentinclassshallnotgetmysupportneednthavesetoffsoearlyIII.阅读下面的对话，按照句子结构的语阅读下面的对话，按照句子结构的语法性和上下文连贯的要求，在空格处法性和上下文连贯的要求，在空格处使用合适的情态动词填空。使用合适的情态动词填空。Doyoucallthatahat?Isaidtomywife.You_besorudeaboutit,mywifeansweredasshelookedatherselfinthemirror.Isatdownononeofthosemodernchairswithholesinitandwaite

21、d.Wehadbeeninthehatshopforhalfanhourandmywifewasstillinfrontofthemirror.needntWe_buythingswedontneed,Iremarkedsuddenly.Iregrettedsayingitalmostatonce.You_havesaidthat,mywifeanswered.I_remindyouofthatterribletieyouboughtyesterday.mustntneedntneedntIfinditbeautiful,Isaid.Aman_neverhavetoomanyties.Andawoman_havetoomanyhats,sheanswered.Tenminuteslaterwewalkedoutoftheshoptogether.Mywifewaswearingahatthatlookedlikealighthouse!cantcanFinishUsingStructuresonPage50ofWorkbook.