情态动词完整

GrammarFocus情态动词must,canneed等情态动词canhadbettermustneed(能)(最好…)(需要)(必须)haveto(不得不)情态动词情态动词后面+动词原形情态动词没有人称和数的变化1Icannotplaybasketball.

Ineedbuy/boughtacomputer.

2Shecan/cansrideahorse.

Amyneed/needsbuyabook.------------3否定式构成是在情态动词后面加"not"Icanplay/playedbasketball.

---can(能)用法:①表示能力:HecanspeakalittleEnglish.

Canyoufly?

③表示请求或允许:

CanIhelpyou?

②表示猜测:ThatcannotbeourEnglishteacher,becauseshehasgonetoShanghai.

could也可表示请求，语气委婉，主要用于疑问句，不可用于肯定句，答语应用canCouldIcometoseeyoutomorrow?

Yes,youcan.（否定答语可用No,I'mafraidnot.）{{{注意{用法:①表示请求或允许:MayIgohome，please?

(1)以may（表许可或请求）开头的一般疑问句,肯定回答用may，否定回答用mustn't或can't.(2)在疑问句中不用于第二人称②表示可能性:Youmayberight.

No,you_________{{may(可以)Yes,youmay.注意might为may的过去式，但也可以代替may，语气较为婉转客气或更加不肯定。Youmightberight.

mightmustn’t/youcan’t.试比较:●Youmay

notsmokehere．(不可以)语气轻

●You

can’tsmokehere．（不能）重●You

mustn’t

smokehere．（决不可）最重can'tmaynotmustn't↓用法:既可以做情态动词,也可以做实意动词②实意动词(needtodosth):①情态动词(needdosth)

Ineedbuyabighouse.need(需要)Heneeddrivemehome.DoIneedtobuyabighouse?Heneedstobuyabighouse.NeedIbuyabighouse?--Yes,youmust.--No,youneedn’t/don’thaveto.(不必要)--Yes,youdo./--No,youdon’t.{{用法:②表示推测“肯定，一定”:①表示义务、必要或命令

:

Youmustcomeearlytomorrow．

---MustIfinishmyhomeworkfirst?Theymustbeathome.Thelightison.

---Yes,youmust.---No,youdon'thaveto/needn't.{must(必须)注意must开头的疑问句，其否定回答通常用don‘thaveto或needn’t。而不用mustn'tmustn't(禁止)③否定时表示“禁止”

:Youmustn’tsmokehere.用法:It’seleveno’clock.Ihavetogonow.Itwasgettingdark.Hehadtofinishtheworkfirst.

Idon’thavetogonow.Hedoesn’thavetofinishtheworkfirst.haveto(必须)注意haveto

表示客观因素Weareverygladattheparty,butit’s11,sowehavetoleavenow.must表示主观因素Wemuststudyhardtofindagoodjobforourselves.must(必须)Mybrotherwasveryill,soI

callthedoctorinthemiddleofthenight.Hesaidthatthey

workhard.Youdon'thavetotellhimaboutit.

Youmustn'ttellhimaboutit.

你不一定要把此事告诉他。你一定不要把这件事告诉他.havetomusthadtomust区别}hadbetter意为“最好”，表示建议和劝告，简略式为‘d

better，否定式为had

better

not，后面跟动词原形。You

had

better

go

to

see

a

doctor.You’dbetternotstayhere.hadbetter(最好)beabletois/are/amableto==canwas/wereableto===couldwillbeabletohas/havebeenableto你能来参加我的生日聚会吗？Willyou_______________cometomybirthday?三岁时他会游泳。He____________swimattheageofthree.

will/wouldyou....?shallI/we....?should应该usedtousedtobeHeusedtobeateacherHedidn'tusetobeateacherHeusedn'ttobeateacher.usedtodoHeisaworker,buthe___________(过去是老师）He___________(过去在这游泳）whenhewasyoung.

Exercises1.—CouldIborrowyourdictionary?—Yes,ofcourseyou_______.A.mightB.willC.canD.should2.You______returnthebooknow.Youcankeepittillnextweekifyoulike.A.can’tB.mustn’tC.needn’tD.maynotCC3.Johnny,you______playwiththeknife,you______hurtyourself.A.won’t;can’tB.mustn’t;mayC.shouldn’t;mustD.can’t;shouldn’tB

4.--Willyoustayforlunch?--Sorry,_____.Mybrotheriscomingtoseeme.A.Imustn’tB.Ican’tC.Ineedn’tD.Iwon’t5.--MayIpickaflowerinthegarden?--________.A.No,youneedn’tB.Not,please.C.No,youmustn’tD.No,youwon’tBC6."MustIdrivetohishouseandpickupthechildren?"

"No,

."