【课件】Unit+3Discover+Useful+Structures+课件人教版（2019）选择性必修第二册

UNIT3

FOODANDCULTUREDiscoverUsefulStructures过去完成时1：什么是过去完成时(PastPerfect)？TheSmithshadjustleftwhenyourang.1.什么是过去完成时？基本定义：

过去完成时是表示过去某个时间之前已经发生的动作或一直延续的动作或状态。常与already，yet,still等时间状语连用，也可用于虚拟语气。理解“过去的过去”：过去过去的过去现在例：Thefilmhadbegunbeforewegottothecinema.我到达电影院之前电影已经开始了。先发生的动作用过去完成时，后发生的动作用一般过去时。hadbegungot

2.过去完成时(PastPerfect)结构？2.过去完成时的结构？

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

（落地在前，搜查在后）Halensaidshehadmovedtoanotherflat.(说之前已经搬家)3.过去完成时(PastPerfect)运用在by,

bytheendof,bythetime,before后接表示过去某一时间的短语或从句。

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

过去完成时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+形容词最高级+可数名词单数+thatsb.haddonesth.e.g.Itwasthemostinterestingmoviethathe_____________(watch).11hadmentionedhadwatched

用于虚拟语气中肯定结构had＋beendone否定结构had＋not＋beendone一般疑问结构had＋主语＋been

done特殊疑问结构特殊疑问词＋had＋主语＋been

done4.过去完成时的被动语态

：

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