Unit 12 Section A (Grammar Focus-4c)(课件PPT)-【优翼·学练优】2021-2022学年九年级下册初三英语（人教版）

九年级（下） Go for it! 优翼英语教学课件 Section A (Grammar Focus-4c) 优翼九年级英语下（RJ） 教学课件 Unit 12 Life is full of the unexpected. 学习目标 Key words & phrases: cream, workday, show up, bean, market, by the end of Key sentences: 1.By the time I arrived at the party, everyone else had already shown up. 2. When she arrived at the movie theater, she remembered she had forgotten to feed her dog. . To learn the past perfect tense. Presentation Grammar Focus When I got to school, I realized that I had left my backpack at home. By the time I got 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. Grammar 过去完成时：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) 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 + 过去分词 。 语法概述 过去完成时的句式结构 (1) 肯定句：主语 + had + 过去分词 + 其他. (2) 否定句：主语 + hadn’t + 过去分词 + 其他. (3) 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. 过去完成时的用法 表示一个动作或状态在过去某一时间动作之前已经发生或完成，常与by、 before等构成的时间短语连用。 常用在said、told、knew、heard、realized等后面的宾语从句中。 (3) 在含有when、 before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。 (4) 过去完成时是一个相对的时态，只有和过去的某个时间或动作相比较时才会用到，因此可通过分析语境来确定时态。 过去完成时与一般过去时的区别 一般过去时表示过去某时间发生的动作或存在的状态，而过去完成时则表示过去某一时间以前（即过去的过去）发生的动作或存在的状态。 Practice 4a Make sentences using by the time or before. 1. Tim went into the bathroom. Mary got up. ____________________________________ ____________________________________ 2. The coffee became cold. I put cream in the coffee. __________________________________ __________________________________ Before I put cream in the coffee, the coffee had become cold. By the time Mary got up,Tim had already gone into the bathroom. 3. The teacher collected the math homework. I got to school. ________________________________________ ________________________________________ 4. I completed the work f