2023學(xué)年完整公開課版米占東直播228

米占東名師網(wǎng)絡(luò)工作室直播課堂UNIT2HealthyEatingDiscoveringusefulstructures主講：米占東GrammarandUsage情態(tài)動(dòng)詞對(duì)過去推測(cè)用法

理解推測(cè)推測(cè)肯定mustcouldmaymightcannot

couldnotmaynotmightnot肯定句否定句/疑問句havebeen+表語（狀態(tài)）havedone（動(dòng)作）havebeen+表語（狀態(tài)）havedone（動(dòng)作）must不用在否定或疑問句中，can不用在肯定句中說出下列結(jié)構(gòu)的含義musthavedonecould/may/mighthavedonecan'thavedonecould/may/mightnot+havedonecan/could/mighthavesbdone(≠M(fèi)ay…h(huán)avedone?)過去肯定做過某事過去不可能做過某事過去也許做過某事（肯定句）過去做過某事嗎？(疑問句）過去可能沒有做過某事

“must+have+done”

表示對(duì)過去事情的肯定推測(cè)，譯成“過去一定做過某事”，該結(jié)構(gòu)只用于肯定句。1.Itmusthaverainedlastnight,forthegroundiswet.昨晚一定下雨了，因?yàn)榈孛孢€是濕的。

2.Youmusthavebeenmadtospeaktotheservant.

你和仆人說話，一定是發(fā)瘋了。

“couldhavedone”1)表示猜測(cè)，“過去可能做過某事”,多用于疑問句；2)用于虛擬語氣，意思是“本來能夠做某事而沒有做”。Whatcouldhavehappened?難道可能發(fā)生了什么事嗎？Thisglassiscracked.Someonecouldhavedroppedit.

這個(gè)玻璃杯破了。可能是誰把它掉在地上了。

Hecouldhavepassedtheexam,buthewastoocareless.本來他能夠通過考試，但是他太粗心。“mayhavedone”

表示對(duì)發(fā)生過的事情的推測(cè)，意思是“可能已經(jīng)”或“也許已經(jīng)”，用于肯定句中。—WhathashappenedtoGeorge?—Idon'tknow.Hemayhavegotlost.—喬治發(fā)生了什么事？——我不知道，他可能迷路了。

“mighthavedone”

1)表示對(duì)過去事情的推測(cè)，might與may意思相同，但可能性更小。1.Hemighthavegivenyoumorehelp,eventhoughhewasbusy.他或許會(huì)多給你一些幫助，即使他很忙。Hecan’t/couldn’t/maynot/mightnothavegoneoutbecausethelight’son.

(現(xiàn)在對(duì)過去的推測(cè))Ithoughthecouldn’t/mightnothavegoneoutbecausethelightwason.

(過去對(duì)過去之前的推測(cè))

學(xué)習(xí)理解can/could/may/mightnot+havedone二、“can’thavedone”

“couldn’thavedone”

不可能做過某事表示對(duì)過去事情的否定推測(cè)，“couldn’thavedone”較少使用。1.Mr.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。2.Marycan'thavestolenyourmoney.Shehasgonehome.瑪麗不可能偷你的錢，她回家去了?！癱an…h(huán)avedone”

表示對(duì)發(fā)生過的事情的推測(cè)，用于疑問句中。It`ssolate.Wherecanshehavegone?天晚了，她可能去哪兒了呢？

“couldhavedone”1)表示猜測(cè)，“過去可能做過某事”,多用于疑問句；Whatcouldhavehappened?難道可能發(fā)生了什么事嗎？Thisglassiscracked.Someonecouldhavedroppedit.

這個(gè)玻璃杯破了。可能是誰把它掉在地上了。

小綜合練習(xí)1. —IthinkHelenisathome.

—No,she_____be,forshephonedmefromtheairportjustfiveminutesago. A.mustn’t B.needn’t C.can’t D.oughtnot2.-Goodmorning.IgotanappointmentwithMissSmithyesterday.-Ah,you______beMr.Peter.A.mightB.mustC.wouldD.can7. —Thereisnolightintheroom.

—_____hebesleeping? A.Must B.Shall C.Can D.Will8.Hurryup,he_____foryouattheschoolgatenow. A.maybewaiting B.mayhavewaited C.mustbewaiting D.mightwait9.Thiscakeisverysweet.You______alotofsugarinit.

A.shouldput

B.couldhaveput

C.mightput

D.musthaveput

10.——Ileftmyhandbagonthetrain,but

luckilysomeonegaveittoarailwayofficial.

——Howunbelievabletogetitback!Imean,someone______it.

A.maysteal

B.mighthavestolen

C.muststeal

D.musthavestolen11.-Shelooksveryhappy.She__havepassedtheexam.-Iguessso.It’snotdifficultafterall.A.shouldB.couldC.mustD.might12.She___haveleftschool,forherbikeisstillhere.A.can’tB.wouldn’tC.shouldn’tD.needn’t11.-Shelooksveryhappy.She__havepassedtheexam.-Iguessso.It’snotdifficultafterall.A.shouldB.couldC.mustD.might12.She___haveleftschool,forherbikeisstillhere.A.can’tB.wouldn’tC.shouldn’tD.needn’t5.Michael____beapoliceman,forhe’smuchtooshort.A.needn’tB.can’tC.shouldD.may6.----IstayedatahotelwhileinNewYork.----Oh,didyou?You____withBarbara.A.couldhavestayedB.couldstayC.wouldstayD.musthavestayed7.MysistermethimattheGrandTheateryesterdayafternoon,sohe____yourlecture.A.couldn’thaveattendedB.needn’thaveattendedC.mustn’thaveattendedD.shouldn’thaveattendedBAA總結(jié)“情態(tài)動(dòng)詞+完成式”

must/could/may/might+havedonecan'tcould/may/mightnot+havedonecan/could/might+havesb.done?should(oughtto)havedoneshouldn't(oughtn'ttohavedone