1、UNIT 3 FOOD AND CULTUREDiscover Useful Structures1：什么是过去完成时(Past Perfect)？The Smiths had just left when you rang.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：The film had begun before we got to the cinema.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
2、的动作用一般过去时。had begungot 2.过去完成时(Past Perfect)结构？2.过去完成时的结构？When the police arrived,the thieves had run (run)away.(逃走在前，警察到达在后逃走在前，警察到达在后)After we had landed,the plane was searched thoroughly.（落地在前，搜查在后）（落地在前，搜查在后）Halen said she had moved to another flat.(说之前已经搬家)3.过去完成时(Past Perfect)运用在by,by the end
3、of,by the time,before后接表示过去某一时间的短语或从句。e.g.By the end of last year,we _(produce)20,000 cars.The train _(leave)before we reached the station.had producedhad leftBy nine oclock last night，we _(get)200 pictures from the spaceship.had got典例1By the end of June,they _(treat)over 800 patients.had treatedBy
4、the time the policeman _(get)to the shop,Tom _(run)away.gothad run 过去完成时常用于一些固定句型：过去完成时常用于一些固定句型：(1)It/This/That was the first/second.time+that sb had done sth.e.g.It was the third time that he _(mention)his mother in his speech.(2)It/This/That was the+形容词最高级形容词最高级+可数名词单数可数名词单数+that sb.had done sth.
5、e.g.It was the most interesting movie that he _(watch).11had mentionedhad watched 用于虚拟语气中肯定肯定结构结构hadhadbeenbeen done done否定否定结构结构hadhadnotnotbeenbeen done done一般疑问一般疑问结构结构hadhad主语主语beenbeen donedone特殊疑问特殊疑问结构结构特殊疑问词特殊疑问词hadhad主语主语beenbeen donedone1.It _(know)for a long time that Yellowstone was volc
6、anic in nature thats what accounted for all its hot springs and other steamy features.(2019江苏江苏)2.A rescue worker risked his life saving two tourists who _(trap)in the mountains for two days.(2018北京北京)3.I was sent to the village last month to see how the development plan _(carry)out in the past two years.(2018江苏卷江苏卷)had been known had been trapped had been carriedTHANKS
