高中英语必修3unit2-语法b3unit2Grammar课件

Discoveringusefulstructures---ModalVerbs(II)Unit2HealthyeatingReadthetextandfindoutthesentencescontainingmodalverbs1.Thenusuallybylunchtimetheywouldallbesold.2.Bynowhisrestaurantoughttobefullofpeople.

3.Whatcouldhavehappened?4.Nothingcouldbebetter…5.SomethingterriblemusthavehappenedifLiChangwasnotcomingtoeatinhisrestaurantashealwaysdid.6.Hecouldnotbelievehiseyes.7.Perhapsheshouldgotothelibraryandfindout.8.HecouldnothaveYongHuigettingawaywithtellingpeoplelies!9.EventhoughhercustomersmightgetthinaftereatingYongHui’sfood…10.Theywouldbecometiredveryquickly.11.…hecouldwinhiscustomersback.ModalVerbs(II)ought(oughtn’t)to/should(should’t)haveto/mustneed/darecan/can’t“应该，要”，无人称时态和数的变化

He

ought

to

come

tomorrow.

否定式oughtnotto（oughtn’tto）疑问式Oughtsbto…?Heoughtnottobesocareless.Oughthetoseethedoctor?表推测，按理应该，非常可能Ifhestartedyesterday,heoughttobeinShanghainow.如果他昨天出发的话，现在应该在上海了。oughttoought(oughtn’t)to&should(shouldn’t)

表责任或者劝告“应该”，后者语气较强ThereissomethingIoughttotellyoubeforeyouleave.在你们离开之前我有事要告诉你们。Youshouldhavearestaftersports.运动之后你应该休息一下。hadbetter口语中常用，表示最好（做或不做某事）Youhadbetterstayhere.你最好呆在这里。“不得不”有人称、时态的变化

Tomhastoattendanimportantmeetingthisafternoon.今天下午汤姆不得不参加一个重要的会议。have(got)toMusttheydo…?Yes,theymust.No,theyneedn’t/don’thaveto.

musthaveto主观／客观主观客观时态

现在，将来多种表推测√

×询问意愿√

×否定意义mustn’t禁止，不允许don’thaveto不必(相当needn’t)need“需要”和dare“敢”既可用作情态动词，也可用作实义动词。作情态动词主要用于否定句和疑问句。

You

needn’t

telephone

him

now.

She

dare

not

go

out

alone

at

night.

作实义动词时，可用于各种句式。

You

don’t

need

to

do

it

yourself.

We

need

to

tell

them

the

news.

Hedidnotdare(to)lookup.Idaresay…为固定习语“我想，很可能，大概”

Idaresayhe’llcomeagain.

大概他将会再来。dare&need注意对need问句的回答:--NeedIfinishtheworktoday?--Yes,________________.No,________________.No,________________.youmustyouneedn’tyoudon’thavetoneedn’t对其它情态动词的回答:--ShallItellJohnaboutit?--No,you__________.--No,you__________.

--Mustwedoitnow?--No,you__________.--No,you__________.needn’tdon’thavetoneedn’tdon’thavetocan&can’t(could&couldn’t)1.表示能力2.表示可能Hecan(not)swimacrossthatriver.表可能时,can常用于疑问句或否定句中---Canthenewsbetrue?---No,itcan’t.表能力“must+have+done”表示对过去事情的肯定推测，译成“一定做过某事”，该结构只用于肯定句。Youmusthavebeenmadtospeaktotheservant.你和仆人说话，一定是发疯了。Ididn’thearthephone,Imusthavebeenasleep.

我没听到电话，我一定是睡着了。“情态动词+havedone”的用法can

/

could

not+

have

done对过去行为的怀疑或不肯定,

表示否定推测。“不可能…”Mr.Smithcan’thavegonetoBeijing,forIsawhiminthelibraryjustnow.史密斯先生不可能去北京了，我刚才还在图书馆见过他。He

can’t

have

been

to

America.

他不可能去过美国。

could

+

have

done表示“本来可以做而实际上没做某事”；You

could

have

done

better,

but

you

didn’t

try

your

best.

你本来可以做得更好，但你没努力。Hecouldhavepassedtheexam,buthewastoocareless.本来他能够通过考试，但是他太粗心。might/mayhavedone表示对过去发生的动作进行的可能性推测。“可能已经”“也许已经”，

Hemayhavegonetothehospital.

他可能去医院了。might的可能性更小。Hemighthavegivenyoumorehelp,eventhoughhewasbusy.他或许会多给你一些帮助，即使他很忙。

Hemighthavereadaboutthenewsinthenewspaper.

他可能已经从报纸上知道这个消息了。

ought

to

/shouldhave

done

本应该做而实际未做，有责备批评的意味。意为“本应该…但…”

Youshouldhavetoldherthetruthearlier.你应该早点告诉她真相。

Sheshouldn’thaveleftwithoutsayingaword.她本不应该一言不发地离开。You

oughtnot

to

have

told

him

about

the

news.

你不应该告诉他这个消息。ought

notto

/shouldnothave

done本不应该做而实际做了needhavedone本需要做某事而实际未做needn’thavedone本不需要做某事而实际上做了TomneedhavecleanedtheclassroominsteadofLilythismorrow.今天早上汤姆本需要代替莉莉打扫教室的。

Therewasplentyoftime.Ineedn’thavehurried.(ButIhurried.)时间很多，我本不需要着急的。Youneedn’thavestayedhere.你本不需要留在这。1.You____allthoseclothes!Wehaveawashingmachinetodothatsortofthing.

A.needn'thavewashedB.shouldn'thavewashed

C.mustnothavewashedD.cannothavewashed

A2.John'sscoreonthetestisthehighestintheclass;he____lastnight.

A.shouldstudyB.shouldhavestudied

C.musthavestudiedmusthavetostudy

C3.Theroomisinaterriblemess;it____cleaned.

A.can'thavebeenB.shouldn'thavebeen

C.mustn'thavebeenD.wouldn'thavebeenAAshehadheartattack,hewastoldthathe____continuethework.

A.needn'tB.maynotC.mustn'tD.can't5.Twoeyes____seemorethanone.

A.canB.mayC.willD.should

CA6.You____totowntoseethefilmyesterday.ItwillbeonTVtonight.

A.needn'tgohadbetternotgoshouldnotgoD.needn'thavegone

D7.Ididn'tsendoutmyapplicationformlastweek,butI____.

A.hadB.woulddoC.shouldhaveD.mighthaveto

C8.____youconti