人教版（2019）必修第三册Unit 5 The Value of Money Discovering useful stuctures同步课件

ModelsforGuessing表推测的情态动词must

为肯定发生can’t/couldn’t

为不可能发生；couldn’t否定意味没有can’t强烈will/would/can/could/may/might为可能发生，语气依次减弱will/would/can/could/may/mightnot为可能不会发生，语气依次减弱mustn’t不表推测，意为“禁止”情态动词可以表示对将来、现在或过去情况的推测，推测结果有三种肯定发生；可能发生；不可能发生。对现在、将来的动作推测

情态动词+be；情态动词+do；对正在发生的动作推测

情态动词+bedoing”。对过去情况的推测，情态动词+

havedone”Hemustworkveryhard=I’msurehegenerallyworksveryhardTheremustbeanotherwayofdoingit.一定有别的方法做这件事。Goingbyherclothes,shemustbeveryrich.从她的衣着来判断，她一定很有钱。Shemust

arrivebefore5

5:00前她一定到.Theymustbeworking.他们一定正在工作。must

domust

bemust

bedoing对现在或将来情况作推测，意思是“一定”Theycan’tberich==Idon’tthinktheyarerich.Thatcan’tbeMary—she’sinhospital.那个人不可能是玛丽——她住院了。Themooncan

notalwaysbeatthefull.月不可能常圆。You’llseeitonyourleft.Youcan’tmissit.它在你的左手边。你一定不会错过Youcouldn’tbehungry.You’vejusthaddinner.你不会饿的。你刚吃过饭can’t/couldn’tbecan’t/couldn’tdo,couldn’t语气较can’t稍弱对现在或将来情况作推测，意思是“不可能”Itcouldrainlaterthisevening.今晚晚些时候也许会下雨。Momwillbedownstairsnow.妈妈现在应该在楼下吧Hewouldnotbeveryhappy.他可能不会很高兴。Hemaynotbelieveyou.他可能不会相信你。Iwasafraidshemightbeinbednow.我担心她可能已经睡觉了。Shecouldbethinkingabouthertest.她可能正在想她的测试will/would/should/can/could/may/might+be/do对现在或将来情况作推测，意思是“可能”语气依次减弱对现在、将来的动作推测

情态动词+be；情态动词+do；对正在发生的动作推测

情态动词+bedoing”。总结Shemay/might/couldarrivebefore5.

Shemustarrivebefore5.

Hemustbelisteningtotheradionow.

Hemay/might/couldbelisteningtotheradionow.

Hecan't(couldn't)beathomeatthistime.

Hemay(might)notbeathomeatthistime.

5:00前她可能/也许到。5:00前她一定到。他一定正在听收音机。他可能/也许正在听收音机。这个时候他不可能在家。这个时候他可能不在家。Assheisnothere,Isupposeshemusthavegonehome.她既然不在这里，我料想她必定是回家了。Theycan’thavegoneoutbecausethelight’son.他们不可能出去了，因为灯还亮着。Shecouldhaveforgottentotellhim.她可能忘记告诉他了HewillhavegonebacktoEngland.他可能已回英国去了。Shewouldnothavenoticedit.她也许还没有注意到这事。She’slate.Ithinkshemayhavemissedthetrain.她迟到了。我想她可能误了火车。Shemighthavereaditinthepapers.她可能在报上已读到过此事。AnnmightnothaveseenTomyesterday.安昨天可能没有见到汤姆。对过去情况的推测，情态动词+

havedone”must

havedone

must

havebeen

对过去情况作推测，意思是“过去一定”can’t/couldn’thavebeencan’t/couldn’thavedone,couldn’t语气较can’t稍弱对过去情况作推测，意思是“过去不可能”will/would/should/can/could/may/might+havebeen/havedone

对过去情况作推测，意思是“过去可能会”will/would/should/may/mightnot+havebeen/havedone

对过去情况作推测，意思是“过去可能不”Itmusthaverainedlastnight.Thegroundiswet.

地湿了，昨晚肯定下雨了。地湿了，昨晚可能/也许下雨了。Itwill/would/should/may/mighthaverainedlastnight.Thegroundiswet.

shouldhavedone(oughttohavedone)表示过去本应该做而没有做的事,意为“本应该”。Youshouldhavetoldmeaboutitearlier.shouldn’thavedone(oughtn’ttohavedone)表示过去本不应该做而做了的事。意为“本不应该”。Youshouldn’thavesaidsuchwordstoyourparents.needn’thavedone表示“本无必要做某事而实际上做了”。Youneedn’thavewalkedsoquicklysincetimewasenough.couldhavedone表示“本来能……而事实上未做到”。如：Icouldhavecomeontime,butmycarbrokeontheway.must,can,could,will,would,may,might,should,oughttomust>may>might（could）can,could一般用于否定句和疑问句中can’t一定不，是must的否定句.–ThatmanmustbeSarah’shusband.

--No,he_____beherhusband.Sheisstillsingle.

A.can’t B.mustn’t C.maynot D.oughttoPeter_____comewithustonight,butheisn’tverysure.

A.must B.may C.can D.will4.–What____itbe?

--It______beamailbox,foritismoving.It______beacar.

A.can;can’t;mustB.can;can;must

C.can;mustn’t;mustD.must;mustn’t;can5.–Look,someoneiscoming.Guess__________.

--Jack.He’salwaysontime.

A.whocanitbeB.whohemay

C.whohecanbeD.whoitcanbe6.David,you_____playwiththevaluablebo