人教版新目标英语九年级Unit12-Life-is-full-of-the-unexpected-Section-A-Grammar-Focus--4c.ppt

思考与讨论：1. 在以下的时间状语从句中，主句和从句的动作是先后发生还是同时发生？2. 主从句都用一般过去时态的时间状语从句的引导词有什么？ When he came in, the students stood up. When the baby saw her mother, she stopped crying. He was about to watch a movie when his parents knocked at the door. They were about to get on the bus when they heard someone shout. As I was standing in front of the teacher’s office, I saw a boy fight with another boy. As he was doing housework, a bird flew into the kitchen. 1）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。2）主从句都用一般过去时态的时间状语从句引导词有（when , as ）等 When he came in, the students stood up. When the baby saw her mother, she stopped crying. He was about to watch a movie when his parents knocked at the door. They were about to get on the bus when they heard someone shout. As I was standing in front of the teacher’s office, I saw a boy fight with another boy. As he was doing housework, a bird flew into the kitchen. * Unit 12 Life is full of the unexpected. Section A Grammar Focus – 4c Grammar Focus When I go 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. When I go 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. 讨论： 为什么主句分别使用过去完成时态和一般过去时态 在使用不同时态时从句和主句的动作的先后顺序。 过去完成时 (1) 构成：由“助动词had(用于各种人称和数) + 过去分词”构成 否定式：had not + 过去分词 缩写形式：hadn’t (2) 用法：过去完成时表示在过去某一时间或动作之前已经发生或完成了的动作。 (3) 它所表示动作发生的时间是“过去 的过去”。 ① 表示过去某一时间可用by, before 等构成的短语来表示。 ② 也可以用when, before 等引导的时间状语从句来表示。 ③ 还可以通过状语从句或通过上下文暗示。 主语＋had not／hadn’t+ p.p.+其它. Had+主语＋p.p.+其它? 主语＋had