初中情态动词讲解PPT课件

Learninggoals:,复习部分情态动词的用法,1,2,情态动词的新用法情态动词表示推测,3,对物品的归属进行猜测,思考？,你记得学过哪些主要的情态动词吗？,1,2,情态动词有哪些语法特征呢？,can.could,may,must，might,haveto,3,情态动词如何使用呢？,1.情态动词有具体的词义。2.情态动词没有人称和数的变化。3.情态动词后必须跟动词原形，两者一起构成谓语动词。4.一般疑问句提前边，否定句在后直接加not.,can/cannot,1.表示能力(会)1)MarycanspeakEnglish,butshecannotspeakFrench.2)Canyouliftthisheavybox?3)Canyouskate?2.表示允许(可以)1）CanIuseyourdictionary?2）-CanIgohomenow?-Yes,youcan./No,youcant.,1.是can的过去式；表示过去的能力；Hecouldrideabikeattheageoffive.2.用于婉转语气,多用于问句。“能，可以”Couldyoupleasecleantheroom?-CouldIcometoseeyoutomorrow?-Yes,youcan.(No,youcant.)此处could不是过去式，只是语气更委婉，答语中不能用could和couldnt，要用can和cant。,could,may/maynot,1.表示请求和允许(可以),比can正式.MayIcomein?Hemaycomeifhelikes.,may的用法:,may/maynot,may的一般疑问句，其否定回答用cant或mustnt。1.-MayIgohomenow?-Yes,youmay./Sure./Yes,please.No,youcant./mustnt.2.-MayIuseyourwashroomnow?-No,you_.Theressomethingwrongwiththetoilet.A.needntB.mustntC.shouldntD.didnt,B,must/mustnot,must必须,表示说话人的主观意志。Youmustdoyourhomeworkfirst.,must的用法:,must/mustnot,mustnt表示禁止，不准，不允许。Youmustntsmokehere.Youmustntplaywithfire.,mustnot的用法:,must/mustnot,以must开头的疑问句，肯定回答：Yes,must.否定回答:No,neednt.或No,donthaveto.-MustIcleantheclassroomnow?-Yes,you_.-No,you_./No,you_.,must,neednt,donthaveto,need作情态动词，主要用于疑问句和否定句中need一般疑问句:肯定回答用Yes,must，否定回答用No,neednt.或No,donthaveto.如：NeedIdoitnow?Yes,you_。No,you_.need作行为动词，有人称、数和时态的变化后接todo，即needtodosth.,need,must,neednt/donthaveto,might/may,might1.是may的过去式。2.表示推测,可能性较小。1)Hemightbeverybusynow.2)Yourmothermightknowthetruth.may也表示猜测，意为“可能”。3)WhereismyEnglishbook?Itmight/maybeinyourdesk.,.用适当的情态动词填空：1.Icanplayfootball._youswim?2.Icantplaywithyou.I_finishmyhomeworkfirst.3.I_getupearlytomorrow.becauseIhaveameeting.4.Nobody_livewithoutair.,Can,must,must,can,5._Icomein?Yes,please.6._youpleasetellmewherethestationis?7.MustIfinishtheworknow?No,you_.8.-NeedItakethisbookout?-Yes,you_.A.canB.mayC.needD.must9._thegirlreadbeforeshewenttoschool?A.CanB.MustC.CanD.Could,May,Could,neednt,D,D,情态动词表示推测,Guessinggame,Whosedogisthis?,Itmight/couldbe_.,Heisasingerandactor,heisknownbyeveryone.,Whosedogisthis?,ItmustbeLiuDehuas.,Itmight/couldbe_.,Heisasingerandactor,heisknownbyeveryone.,Anactor,heistall,coolandpopular.,Whosedogisthis?,Itmight/couldbe_.,Anactor,heistall,coolandpopular.,Whosedogisthis?,Itmight/couldbe_.,ItmustbeZhangHans.,Heisabasketballplayer.,Whosecaristhis?,Itmight/couldbe_.,Heisabasketballplayer.,Whosecaristhis?,Itmight/couldbe_.Itmustbe_.Itcantbe_.,mine,YaoMings,Heisrichbuthelpful.,Whosecaristhis?,Itmight/couldbe_.Itcantbe_.Itmustbe_.,Heisrichbuthelpful.,Whosecaristhis?,Itmight/couldbe_.Itcantbe_.Imustbe_.,mine,BillGates,情态动词表推测讲解,must表示推测,must表示非常肯定的或有把握的推测，意为“一定，必定”。只用在肯定句中，不能用于否定句中。,Eg.Youhaveworkedhardallday.Youmustbetired.,might,could表示推测,语气更委婉，表示的可能性较小，说话中留有余地，意为“可能，也许，或许”。,1.Thefootballmight/couldbeJacks.Helikesallkindsofballgames.2.LiuMeiisntheretoday.Shemight/couldbeill.,cant意为“不可能”,必用在否定句中。-ThemancantbeMr.Green.-HehasgonetoAmerica.,Groupwork,情态动词must,might,could,cant表示推测的含义与用法。情态动词must,might,could,cant后面都接动词原形，都可以表示对现在情况的揣测或推断，但他们的含义有所不同：,must一定，肯定（100%的可能性）,might,could有可能，也许（20%80%的可能性）,cant不可能，不会（可能性几乎为零）,活动探究,情态动词表示推测常考的有：,对某事判断的程度：mustcouldmightcant,must,could,might,cant,练练吧,Choosemust,might,could,cant,cantofillintheblanks.,1.Thestorybook_behers.Ithashernameonit.2.Thebeautifultrousers_beLilys.Becausetheyretoolong.3.Icantfindmykey.It_beleftathome.4.Thevolleyball_beSallysorAnns.Theybothlikeplayingvolleyball.5.Thepiano_belongtoAlice.Sheoftenplaysthepiano.,must,cant,could/might,might/could,might/could,7.Thepen_belongtohim.Itsonhisdesk.,might/could,8.Mymother_beathome.Shelefthomewithme.Shehasgonetogotowork.,cant,9.Thisbasketball_beNings.Heplaysbasketballeveryday.,could/might,10.Thisschooluniform_beNicks.Itstoosmallforhim.,cant,6._thatwalletyours?-No,it_bemine.Mineishere.,Can,cant,用must,could,cant,might填空。,1.-Excuseme,whosebookisthis?-It_beJohns.Ithashisnameonit.2.Theman_bemyEnglishteacher.HehasgonetoCanada.3.It_beJimsfootball.Helikesplayingfootballverymuch.,must,cant,might/could,【例1】-Jimisreadingabookunderthattree.-It_beJim.HehasgonetoHainan.A.mayB.mustntC.cantD.could,C,典型例题解析,【例2】-Whereareyougoingthismonth?-We_gotoXiamen,butwerenotsure.A.needntB.mustC.mightD.mustnt,C,典型例题解析,【例3】WheresMrLi?Ihavesomethingimportanttotellhim.You_findhim.He_Japan.A.maynot,hasgonetoB.maynot,hasbeentoC.cant，hasgonetoD.cant,hasbeento,C,典型例题解析,【例4】CouldIlookatyourpictures?Yes,ofcourseyou_.A.couldB.canC.willD.might,B,典型例题解析,【例5】WhereisJack，please?He_beintheclassroom.2013杭州A.canB.needC.wouldD.must,D,典型例题解析,学习物品的归属,(可能是Mary。),(不可能是Mary。),Mum:Whoisit?,J:ItmustbeTom.,M:Itmight/couldbeMary.,J:ItcantbeMary.SheisinChina.,(一定是Tom。),(可能是Kate。),(绝对不是Marry。),Mum:Whoisit?Jim:(一定是Tom。),ItmustbeTom.,Itmight/couldbeKate.,ItcantbeMarry.SheisinChina.,-It_belongtoMarkorLiliBecausetheybothplayfootball.,-Whosefootballisthis?,mightcouldmust,Lili,Mark,-It_belongtoBush.Because_,Bush,-Whoseredbicycleisthis?,cant,hisbikeiswhiteandblue.,CanthisT-shirtbeJims?,ItcantbeJims.,Becauseitstoosmallforhim.,Jim,Liuxiang,-It_beLiuXiangs.,-Whoseexercisebookisthis?,must,ItmustbelongtoLiuXiang,Becauseithashisnameonit.,语言点：whose谁的,1.Whosetruckisthat?(同义句)_isthat_?2.Ithinkthatismyfathersshirt.（就划线部分提问）_shirtdoyouthink_?3.By_thecarwasinvented?,Whose,thatis,Whose,truck,whom,Whoseisthis?,Itcantbexxs.,Itmustbexxs.,Itcould/mightbexxs.,belongtoxxx.,belongtoxxx.,belongtoxxx.,Itismine/yours/hers/his/ours.,=Itbelongstome/you/her/him/us.,ItsLiPings.,=ItbelongstoLiPing.,belongtosb(名词/代词的宾格)=besbs(名词所有格/名词性物主代词),belongto属于,1.不能用于进行时态2.不能用于被动语态3.belongto+名词或代词的宾格。4.常与名词性物主代词或名词所有格进行句型转换,即：belongto+sb./代词宾格=be+sbs/名词性物主代词。,1.Whoistheowneroftheblackbox?(同义句转换)_doestheblackbox_?2.Wouldyouliketohavea_(野餐)withusthisweekend?,课时训练,Who/Whom,belongto,picnic,3.ThisbikeisLucys.(同义句)Thisbike_Lucy.4.Itmustbehers.(变否定句)It_hers.5.-Whosestorybookisthis?-It_Jack.Isawhimreadingjustnow.A.mustbeB.mustbelongtoC.isD.bebelongto,belongsto,cantbe,B,小结：情态动词归纳,can:1.表示能力，“能，会”2.表示允许，“可以”，CanI?较口语化。3.表示推测。cant只用于否定句中。,could:1.是can的过去式，表示过去的能力。2.could表示更为委婉的语气。3.表示猜测，“很可能”,may:1.表示许可，“可以”。2.以may引导的一般疑问句的否定回答cant/mustnt用。3.表示推测，用于肯定句中。,might:1.是may的过去式。2.表示猜测，可能性比could小。,must：1.表示说话人的主观意志，“必须”。2.mustnt表示“禁止，不允许”。3.must引导的疑问句，否定回答用neednt/donthaveto.4.must表示猜测，”一定“，只用于肯定句中。,nee