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课件网) Unit 12 Life is full of the unexpected. Section A Grammar Focus~4c 学习目标 1 2 理解和掌握本课新词cream，workday，show up，bean，market；在讲解中理解、识记运用本课时的语法知识过去完成时； 归纳总结过去完成时的定义等考点，并与之前学过的时态进行对比，培养学生逻辑性思维。 Read the timeline and make sentences. The plane hit the World Trade Center. 8:46AM Review waited in line with... _____we were waiting in line with other office workers,the plane hit the World Trade Center. As/When (主从句动作同时发生) _____we joined the others to see what’s going on,the plane had hit the World Trade Center. 8: 48AM joined the others to see what’s going on By the time/Before (主句动作发生在从句之前) 新课讲授 The plane took off. _____I got to the airport,the plane had taken off. got to the airport (主句动作发生在从句 动作之前) Review By the time/Before By the time/Before The Past Perfect Tense When I got to school, I realized that I had left my backpack at home. By the time I got back to school, the bell had rung. Before I got to the bus stop, the bus had already left. I was about to go up to my office when I decided to get a coffee first. As I was waiting in line with the other office workers, I heard a loud sound. Classify them according to different tenses. Grammar focus When I got to school, I realized that I had left my backpack at home. By the time I got back to school, the bell had rung. Before I got to the bus stop, the bus had already left. 从句是一般过去时 主句动作发生在从句之前,用过去完成时。 I was about to go up to my office when I decided to get a coffee first. As I was waiting in line with the other office workers, I heard a loud sound. 在以上的时间状语从句中，主句和从句的动作是同时发生，或者是在进行一个动作时，另外一个动作突然发生。可用一般过去时或过去进行时表示。 Make a summary 过去的过去 过去某时 现在 将来 过去完成时 定义：用来描述在过去某一时间或动作之前已经发生或完成了的动作。(过去的过去) 过去完成时 构成：助动词had (用于各种人称和数) + 过去分词 肯定句：主语 + had + 过去分词 + 其他. 否定句：主语 + hadn’t + 过去分词 + 其他. 一般疑问句：Had+ 主语 + 过去分词 + 其他 肯定回答：Yes, 主语 + had. 否定回答：No, 主语 + hadn’t. eg:When I woke up，it had stopped raining. 当我醒来的时候，雨已经停了。 否定句： 一般疑问句： When I woke up，it hadn’t stopped raining. Had it stopped raining when you woke up Yes,it had. No,it hadn’t. 句式 判断依据 ① by+过去的时间点 She had finished reading the book by 9 o’clock yesterday. 到昨天9点钟前，她已经读完了这本书。 ② by the end of+过去的时间点 在...结束时(前) We had completed all the work by the end of last month. 到上个月月底，我们已经完成了所有工作。 由时间状语判定 判断依据 在含有when, before,by the tine等引导的时间状语从句的复合句中， 如果从句的时态为一般过去式，主句常用过去完成时。 1. When I got there, the bus _____ (go). 2. By the time I got to class, the teacher_____(start) the class. 3.我到达公共汽车站之前， 汽车已经离开了。 Before I _____ _____ ... ...
