初中英语语法专题辅导第九讲情态动词课件

ModalVerbs情态动词Ifyouwanttocrossastreet,youmustwaitforthegreenlight.Youmustn’tcrossinfrontofthetraffic.Ifthelightisyellow,youshouldwait.Ifyouarenotcareful,acarmayhityou.IfyouareintheUK,youhavetodriveontheleft.andfindout情态动词,顾名思义是用来表达感情和态度的动词。表明说话人的立场和口气,以及说话想达到的目的常用的情态动词有：can(could),may(might),must,haveto,need,oughtto,shall,should表能力表推测表请求、允许Someofuscanusethecomputernow,butwecouldn’ttenyearsago.Can/CouldIborrowthesebooks?Thestorycannotbetrue.1）能，会：表示能力，相当于beableto(beableto适用于任何时态)。2）可以，表示许可，(may较正式，could较婉转）3）可能，表示否定推测，can’tbe不可能（2012年济南）-----Lisa,_____youspeakFrench?-----Yes,butonlyalittle. A.needB.mustC.mayD.can2013济南---_____Ihelpyou,sir?---Yes,IwantaT-shirt.ACanBShouldCMustDWould

（2010年北京）------＿＿youturndownyourradio,please?------Yes,Ican.A.MayB.NeedC.MustD.Can（2009年济南）-----Who’sthatgirlswimminginthepool?IsitLucy?-----It＿＿beLucy.Sheissleepinginherbedroomnow.A.mayB.can’tC.mustD.should1.表推测2.表请求、允许1.---MayIwatchTVaftersupper?---Yes,youmay.---No,Youmaynot/can’t./You’dbetternot.No,youmustn’t.2.Ifyouarenotcareful,acarmayhityou.

可以，表示许可，相当于can.(注意问句中的回答）2)可能，或许，表示推测

maybe可能1.---MayIwatchTVaftersupper?---Yes,youmay.---No,Youmaynot/can’t./You’dbetternot.No,youmustn’t.(2010年福州)-----Dad,mustIdomyhomeworknow?-----No,you＿＿＿playgameswithyourfriendsforalittlewhile.A.wouldB.needn’tC.mayD.should（2009年广州）—＿＿＿Itakesomephotosinthehall?—No,you＿＿＿.A.Can;needn'tB.Must;mustn'tC.Could;won'tD.May;mustn't1必须，应该Youmustfinishyourtaskbeforeplayinggames.2表示推测，意为“一定”Hemustbeathomenow.3一般疑问句肯定回答用must，否定回答则用needn’t或者don’thaveto.三、must的用法Ifyouwanttocrossastreet,youmustwaitforthegreenlight.Youmustn’tcrossinfrontofthetraffic.---MustIbehomebefore8o’clock?---Yes,youmust.---No,youneedn’t/don’thaveto.3.Theremustbesomethingwrongwithmycomputer.must:必须；mustn’t:不准，禁止回答带有must的问句时，否定式常用needn’t或don’thaveto.3)一定，表示肯定的猜测。（否定猜测用can’t）2013泰安28.—MayIsmokehere?--No,you

.Thisisno-smokingroom.A.needn’tB.mustn’tC.couldn’tD.wouldn’tIfyouareintheUK,youhavetodriveontheleft.Theanimalsweeathavetospendtheirliveslivingintinyspaces.haveto不得不Ihavetobeatworkatnineo’clockeveryday.ShehastoworkonSaturdays.They’llhavetostayinahotel.DoesDickhavetogotoBeijingonbusiness?Hedidn’thavetogotherelastweek.haveto+动词原形haveto有人称、数、时态的变化

当主语为第三人称单数时，用hasto+动词原形变问句或否定句时，需借助助动词。nothaveto=needn’tIhavetobeatworkatnineo’clockeveryday.ShehastoworkonSaturdays.They’llhavetostayinahotel.DoesDickhavetogotoBeijingonbusiness?Hedidn’thavetogotherelastweek.Ihavetobeatworkatnineo’clockeveryday.ShehastoworkonSaturdays.They’llhavetostayinahotel.DoesDickhavetogotoBeijingonbusiness?Hedidn’thavetogotherelastweek.haveto+动词原形haveto有人称、数、时态的变化

当主语为第三人称单数时，用hasto+动词原形变问句或否定句时，需借助助动词。nothaveto=needn’t

2012北京（） —Mum,mustIwashthedishesrightnow?

—No,you____.A.shouldn’t B.wouldn’t C.mustn’t D.needn’t2013莱芜（） Studentsinourschool________knowshoutingisnotallowedinthelibrary.A.canB.mayC.mustD.need2012威海（）—MustIlearnallthesewordsbyheart?

—No,you______.It’llbefineifyoucopytheminyourexercisebooks.A.needn’t B.can’t C.shouldn’t D.mustn’t

两者都表示必须

must

侧重于说话者的主观看法，认为有必要或有义务去做某事；

haveto则重于表示外界客观需要，含有不得不或被迫之意I

didn't

take

the

raincoat

with

me

yesterday.I____wait

for

my

father.

A.have

to

B.has

to

C.had

to

D.must2.Jack’sill,sothey______changetheirplans.

A.mustB.shouldC.havetoD.oughtto用法一用法二用法三作为实义动词，后加todo.用助动词提问或否定四、need的用法作为情态动词，后加do.用need提问或回答need后加doing表被动意义1.Ineedtypethisletteragain.我需要重新录入将这封信.2.Thereisenoughtime.Youneedn’thurry.有的是时间，你不必着急。作情态动词1).Weneedagreatdealofmoneynow.

我们需要很多钱。2).Theydon’tneeditanymore.他们不再需要它了。3).Doesyourfatherneedanyhelp?

你爸爸需要帮助吗?作行为动词+n.Whatdoweneedtotakeforthepicnic?野餐我们需要带些什么？Willweneedtoshowourpassports?我们需要出示护照吗？Youneedtotakegoodcareofyourmother.你要好好照料你妈妈作行为动词+to+doneed:需要1)作情态动词Heneedmakeaplan.2)作行为动词（有人称和数变化，后接名词/带to的动词不定式）。Heneedstomakeaplan.1.---Doweneed_________forthetickettothepark?---No,weneedn’t___________that.It’sfree.topay,todoB.topay,doC.pay,todoD.paying,doing2.Idon’tneed__________toschooltoday.A.togoB.goC.going3.Needhe_________?No.he_________.A.torun,needn’t.B.run,doesn’tneed.C.run,needn’t4.WillSam_________tomorrow?A.needtoleaveB.needleaveC.needstoleaveSummarycan/could1）能，会：表示能力2）可以，表示许可3）可能，表示推测may/might1)

可以，表示许可2)可能，或许，表示推测mustmust:必须；mustn’t:不准，禁止回答带有must的问句时，否定式常用needn’t或don’thaveto.3)一定，表示肯定的猜测。（否定猜测用can’t）haveto

则重于表示外界客观需要，含有不得不或被迫之意need1)作情态动词2)作行为动词（有人称和数变化，后接名词/带to的动词不定式）Summary注意回答形式：

1)MayI…?Yes,youmay.No,youcan’t(mustn’t).

2)MustI…?Yes,youmust.No,youneedn’t.情态动词用法专项练习Exercises:–CanyoulendmeyourMP3?–

Sorry,I__.

Myfatherhastakenitwithhim.A.mustn’tB.can’tC.needn’tD.shouldn’t2.–ShallIgoandmeetyouattheairport?–

No,thanks.I________takeataxihome.A.needB.mustC.shouldD.can3.–Ican’tfindDad.Whereishe?–

I’mnotsure.He____beinthestudy.A.mustB.mayC.needD.will4.Allthepassengers_____wearseatbeltsontheplane.A.canB.mayC.willD.mustExercises:5.–

___theexampaperbehandedinrightnow?–

No,itdoesn’thaveto.Youmayhanditinbefore11:30.A.CanB.MustC.ShouldD.May

6.–Mustwegettothestationbefore6:00?–

No,you_____.Thetrainleavesat9:00.A.mustn’tB.needn’tC.won’tD.can’t7.–Mary,____youspeakChinese?–Yes,onlyalittle.A.mustB.needC.mayD.can8.–

______Icomein?–

Sure,comein,please.A.WillB.MayC.MustD.Need

Exercises:

9.–______Iuseyourmobilephone?–

Certainly.Hereyouare.A.MayB.MustC.ShouldD.Need–MayIputmybikehere?–

No,you_____.Putitoverthereplease.A.needn’tB.won’tC.mustn’tD.wouldn’t11.–

Havingablog(博客)_____helpmemakemorefriends.A.can