九年级英语unit12grammarfocus教案.pptx

会计学 1 九年级英语Unit12grammarfocus Read these sentences and pay attention to the underlined parts. Before I got to the bus stop, the bus had already left. By the time I got back to school, the bell had rung. When I got to school, I realized that I had left my backpack at home. 第1页/共48页 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， 即：过去的过去。 　过去完成时态的概念：  第2页/共48页 时间轴表示 第3页/共48页 肯定式：had + 动词的过去分词       否定式：hadnt + 动词的过去分词 　 疑问式：Had … + 动词的过去分词? 简略回答: Yes, 主 + had. 　　    No, 主 + had not. 特殊疑问句：特殊疑问词或词组+一般疑问句 (Had+主语+过去分词)? 　过去完成时态的构成：  第4页/共48页 1. 过去完成时表示一个动作或状态在过去某一时间或动作之前已经完成或结束，即发生在“过去的过去” 。如： When I woke up, it had stopped raining. 我醒来时，雨已经停了。 （主句的动作发生在“过去的过去”） 过去完成时的用法： By the time they arrived, the bus had left. 当他们到的时候，公交车已经开走了。 第5页/共48页 2. 过去完成时是一个相对的时态，表示的是“过去的过去”，表示 从过去某一时间开始一直延续到过去另一时间的动作或状态。只有和过去某一时间或某一动作相比较时才使用它。如： He told me that he had written a new book. (had written 发生在 told 之前 ) 第6页/共48页 3. 过去完成时需要与一个表示过去的时间状语连用，它不能离开过去时间而独立存在。此时多与already， yet， still， just， before， never等时间副词及 by， before， until等引导的短语或从句连用。如： Before she came to China, Grace had taught English in a middle school for about five years.　 Peter had collected more than 300 Chinese stamps by the time he was ten. 第7页/共48页 4. 过去完成时可表示某一动作或状态在过去某时之前已经开始，一直延续到这一过去时间，而且动作尚未结束，仍然有继续下去的可能。如： By the end of last year, he had worked in the factory for twenty years. （ had worked 已有了 20 年，还有继续进行下去的可能） 第8页/共48页 6:00 7:00 现在 By the time I got up, my sister had already washed all the clothes. 第9页/共48页 I got home My little brother went to bed By the time I got home, my little brother had gone to bed. 第10页/共48页 I got to school The teacher came into the classroom By the time I got to school, the teacher had come into the classroom. 第11页/共48页 By the time she got outside, the bus had already left. 第12页/共48页 1. He ______ in Shanghai University for four years before he ______ to Beijing. A. studied, had gone    B. had studied