高中英語必修3unit2-語法b3unit2Grammar課件

Discoveringusefulstructures---ModalVerbs(II)Unit2HealthyeatingDiscoveringusefulstructuresUReadthetextandfindoutthesentencescontainingmodalverbs1.Thenusuallybylunchtimetheywouldallbesold.2.Bynowhisrestaurantoughttobefullofpeople.

3.Whatcouldhavehappened?4.Nothingcouldbebetter…5.SomethingterriblemusthavehappenedifLiChangwasnotcomingtoeatinhisrestaurantashealwaysdid.Readthetextandfindoutthe6.Hecouldnotbelievehiseyes.7.Perhapsheshouldgotothelibraryandfindout.8.HecouldnothaveYongHuigettingawaywithtellingpeoplelies!9.EventhoughhercustomersmightgetthinaftereatingYongHui’sfood…10.Theywouldbecometiredveryquickly.11.…h(huán)ecouldwinhiscustomersback.6.HecouldnotbelievehiseyModalVerbs(II)ought(oughtn’t)to/should(should’t)haveto/mustneed/darecan/can’tModalVerbs(II)ought(oughtn’t“應該，要”，無人稱時態(tài)和數(shù)的變化

He

ought

to

come

tomorrow.

否定式oughtnotto（oughtn’tto）疑問式Oughtsbto…?Heoughtnottobesocareless.Oughthetoseethedoctor?表推測，按理應該，非?？赡躀fhestartedyesterday,heoughttobeinShanghainow.如果他昨天出發(fā)的話，現(xiàn)在應該在上海了。oughtto“應該，要”，無人稱時態(tài)和數(shù)的變化oughttoought(oughtn’t)to&should(shouldn’t)

表責任或者勸告“應該”，后者語氣較強ThereissomethingIoughttotellyoubeforeyouleave.在你們離開之前我有事要告訴你們。Youshouldhavearestaftersports.運動之后你應該休息一下。hadbetter口語中常用，表示最好（做或不做某事）Youhadbetterstayhere.你最好呆在這里。ought(oughtn’t)to&should(s“不得不”有人稱、時態(tài)的變化

Tomhastoattendanimportantmeetingthisafternoon.今天下午湯姆不得不參加一個重要的會議。have(got)to“不得不”有人稱、時態(tài)的變化

have(got)toMusttheydo…?Yes,theymust.No,theyneedn’t/don’thaveto.

musthaveto主觀／客觀主觀客觀時態(tài)

現(xiàn)在，將來多種表推測√

×詢問意愿√

×否定意義mustn’t禁止，不允許don’thaveto不必(相當needn’t)Musttheydo…?musthaveto主觀need“需要”和dare“敢”既可用作情態(tài)動詞，也可用作實義動詞。作情態(tài)動詞主要用于否定句和疑問句。

You

needn’t

telephone

him

now.

She

dare

not

go

out

alone

at

night.

作實義動詞時，可用于各種句式。

You

don’t

need

to

do

it

yourself.

We

need

to

tell

them

the

news.

Hedidnotdare(to)lookup.Idaresay…為固定習語“我想，很可能，大概”

Idaresayhe’llcomeagain.

大概他將會再來。dare&needneed“需要”和dare“敢”既可用作情態(tài)動詞，也可用注意對need問句的回答:--NeedIfinishtheworktoday?--Yes,________________.No,________________.No,________________.youmustyouneedn’tyoudon’thavetoneedn’t對其它情態(tài)動詞的回答:--ShallItellJohnaboutit?--No,you__________.--No,you__________.

--Mustwedoitnow?--No,you__________.--No,you__________.needn’tdon’thavetoneedn’tdon’thaveto注意對need問句的回答:youmustyouneedncan&can’t(could&couldn’t)1.表示能力2.表示可能Hecan(not)swimacrossthatriver.表可能時,can常用于疑問句或否定句中---Canthenewsbetrue?---No,itcan’t.表能力can&can’t(could&couldn’t)“must+have+done”表示對過去事情的肯定推測，譯成“一定做過某事”，該結構只用于肯定句。Youmusthavebeenmadtospeaktotheservant.你和仆人說話，一定是發(fā)瘋了。Ididn’thearthephone,Imusthavebeenasleep.

我沒聽到電話，我一定是睡著了?！扒閼B(tài)動詞+havedone”的用法“must+have+done”“情態(tài)動詞+havedoncan

/

could

not+

have

done對過去行為的懷疑或不肯定,

表示否定推測?！安豢赡堋盡r.Smithcan’thavegonetoBeijing,forIsawhiminthelibraryjustnow.史密斯先生不可能去北京了，我剛才還在圖書館見過他。He

can’t

have

been

to

America.

他不可能去過美國。

could

+

have

done表示“本來可以做而實際上沒做某事”；You

could

have

done

better,

but

you

didn’t

try

your

best.

你本來可以做得更好，但你沒努力。Hecouldhavepassedtheexam,buthewastoocareless.本來他能夠通過考試，但是他太粗心。can

/

could

not+

have

done對過去行might/mayhavedone表示對過去發(fā)生的動作進行的可能性推測?！翱赡芤呀?jīng)”“也許已經(jīng)”，

Hemayhavegonetothehospital.

他可能去醫(yī)院了。might的可能性更小。Hemighthavegivenyoumorehelp,eventhoughhewasbusy.他或許會多給你一些幫助，即使他很忙。

Hemighthavereadaboutthenewsinthenewspaper.

他可能已經(jīng)從報紙上知道這個消息了。might/mayhavedone表示對過去發(fā)生的動

ought

to

/shouldhave

done

本應該做而實際未做，有責備批評的意味。意為“本應該…但…”

Youshouldhavetoldherthetruthearlier.你應該早點告訴她真相。

Sheshouldn’thaveleftwithoutsayingaword.她本不應該一言不發(fā)地離開。You

oughtnot

to

have

told

him

about

the

news.

你不應該告訴他這個消息。ought

notto

/shouldnothave

done本不應該做而實際做了ought

to

/shouldhave

done

needhavedone本需要做某事而實際未做needn’thavedone本不需要做某事而實際上做了TomneedhavecleanedtheclassroominsteadofLilythismorrow.今天早上湯姆本需要代替莉莉打掃教室的。

Therewasplentyoftime.Ineedn’thavehurried.(ButIhurried.)時間很多，我本不需要著急的。Youneedn’thavestayedhere.你本不需要留在這。needhavedone本需要做某事而實際未做1.You____allthoseclothes!Wehaveawashingmachinetodothatsortofthing.

A.needn'thavewashedB.shouldn'thavewashed

C.mustnothavewashedD.cannothavewashed

A1.You____allthoseclothes!2.John'sscoreonthetestisthehighestintheclass;he____lastnight.

A.shouldstudyB.shouldhavestudied

C.musthavestudiedmusthavetostudy

C2.John'sscoreonthetestis3.Theroomisinaterriblemess;it____cleaned.

A.can'thavebeenB.shouldn'thavebeen

C.mustn'thavebeenD.wouldn'thavebeenA3.TheroomisinaterriblemAshehadheartattack,hewastoldthathe____continuethework.

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

A.canB.mayC.willD.should

CAAshehadheartattack,hewas6.You____totowntoseethefilmyesterday.ItwillbeonTVtonight.

A.needn'tgo