Unit 3 Food and Culture Discover Useful Structures 课件-2023-2024学年高中英语人教版（2019）选择性必修第二册

UNIT 3 FOOD AND CULTURE Discover Useful Structures 过去完成时 1 1：什么是过去完成时(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，后发生的动作用一般过去时。 had begun got 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) After we had landed, the plane was searched thoroughly. （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 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 produced had left By nine o'clock last night，we ________(get) 200 pictures from the spaceship. had got [典例1]By the end of June, they _____________ (treat) over 800 patients. had treated By the time the policeman _______(get) to the shop, Tom __________(run) away. got had run 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+可数名词单数+that sb. had done sth. e.g. It was the most interesting movie that he _____________ (watch). 11 had mentioned had watched 用于虚拟语气中 肯定结构 had＋been done 否定结构 had＋not＋been done 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 done 4.过去完成时的被动语态 ： Summary It ______________ (know) for a long time that Yellowstone was volcanic in nature — that’s what accounted for all its hot springs and other steamy features. (2019江苏) A rescue worker risked his life saving two tourists who ________________ (trap) in the mountains for two days. (2018北京) 3. I was sent to the village last month to see how the developm