【課件】Unit+3Discover+Useful+Structures+課件人教版（2019）選擇性必修第二冊

UNIT3

FOODANDCULTUREDiscoverUsefulStructures過去完成時1：什么是過去完成時(PastPerfect)？TheSmithshadjustleftwhenyourang.1.什么是過去完成時？基本定義：

過去完成時是表示過去某個時間之前已經發(fā)生的動作或一直延續(xù)的動作或狀態(tài)。常與already，yet,still等時間狀語連用，也可用于虛擬語氣。理解“過去的過去”：過去過去的過去現在例：Thefilmhadbegunbeforewegottothecinema.我到達電影院之前電影已經開始了。先發(fā)生的動作用過去完成時，后發(fā)生的動作用一般過去時。hadbegungot

2.過去完成時(PastPerfect)結構？2.過去完成時的結構？

Whenthepolicearrived,thethieveshadrun(run)away.(逃走在前，警察到達在后)Afterwehadlanded,theplanewassearchedthoroughly.

（落地在前，搜查在后）Halensaidshehadmovedtoanotherflat.(說之前已經搬家)3.過去完成時(PastPerfect)運用在by,

bytheendof,bythetime,before后接表示過去某一時間的短語或從句。

e.g.Bytheendof

lastyear,we_____________(produce)20,000cars.

Thetrain________(leave)beforewereached

thestation.

hadproducedhadleftBynineo'clocklastnight，we________(get)200picturesfromthespaceship.hadgot[典例1]BytheendofJune,they_____________(treat)over800patients.hadtreatedBythetimethepoliceman_______(get)totheshop,Tom__________(run)away.gothadrun

過去完成時常用于一些固定句型：(1)It/This/Thatwasthefirst/second...time+thatsbhaddonesth.e.g.Itwasthethirdtimethathe_____________(mention)hismotherinhisspeech.(2)

It/This/That

wasthe+形容詞最高級+可數名詞單數+thatsb.haddonesth.e.g.Itwasthemostinterestingmoviethathe_____________(watch).11hadmentionedhadwatched

用于虛擬語氣中肯定結構had＋beendone否定結構had＋not＋beendone一般疑問結構had＋主語＋been

done特殊疑問結構特殊疑問詞＋had＋主語＋been

done4.過去完成時的被動語態(tài)

：

SummaryIt______________(know)foralongtimethatYellowstonewasvolcanicinnature—that’swhataccountedforallitshotspringsandothersteamyfeatures.(2019江蘇)Arescueworkerriskedhislifesavingtwotouristswho________________(trap)inthemountainsfortwodays.(2018北京)3.Iwassenttothevillagelastmonthtoseehowthedevelopmentplan_____________