英语人教版八年级下册unit5 section a.pptx

1、1. 基本概念 过去进行时表示在过去某一时刻或一段时间内正在进行的动作。这一特定的过去时间除有上下文暗示以外, 一般用时间状语来表示。 2. 结构 was / were + 动词-ing,过去进行时,例如: A: What were you doing at eight last night? 昨晚八点你在干什么？ B: I was taking a shower. 我(当时)在淋浴。 A: What was he doing when the rainstorm came? 暴风雨来的时候他在干什么？ B: He was reading in the library when the rai

2、nstorm came. 暴风雨来的时候他在图书馆看书。,A: What was Jenny doing while Linda was sleeping? 琳达在睡觉的时候, 珍妮在做什么？ B: While Linda was sleeping, Jenny was helping Mary with her homework. 琳达在睡觉的时候, 珍妮在帮助玛丽做作业。,肯定式： I/He/She/It was working. We/You/They/ were working. 否定式: I/He/She/It was not working. We/You/They/ were n

3、ot working.,3. 句式(以work为例),疑问式和简略回答: Was I working? Yes, you were. No, you were not. Were you working? Yes, I was. No, I was not.,Was he/she/it working? Yes, he/she/it was. No, he/she/it was not. Were we/you/they working? Yes, you/we/they were. No, you/we/they were not.,注： 1) Was not 常缩略为 wasnt; wer

4、e not 常缩略为 werent。 2) 一般过去时与过去进行时用法的比较: 一般过去时表示在过去某个时间发生过的动作或存在的状态, 而过去进行时则表示在过去某一时刻或某一段时间正在进行的动作。,例如: David wrote a letter to his friend last night. 大卫昨晚给他的朋友写了封信。(信写完了。) David was writing a letter to his friend last night. 大卫昨晚一直在给他的朋友写信。(信不一定写完。),when和while都可表示“当的时候”，引导时间状语从句。你知道两者在过去进行时中的用法有什么不同

5、吗？ 请仔细观察下面的例句，然后补全空格中的内容。,过去进行时中的 when 和 while, I was walking to school when I saw a cat in a tree. When Sally arrived home, her mother was cleaning the house. 主句的动作是持续性的，而从句动作是 短暂性的，此时用 _ 引导时间状语从 句，主句用 _ 时态，从句用一般 过去时态。,过去进行,when, While I was sleeping in the bedroom, someone knocked at the door. Dav

6、id fell while he was riding his bike. 主句的动作是短暂性的，从句的动作 是持续性的，此时用 _ 引导从 句，主句用 _ 时态，从句 用过去进行时态。,一般过去,while, While Andy was waiting for the bus, he was reading a newspaper. He was cleaning his car while I was cooking. 主句和从句的动作在过去的某时刻或某 段时间同时发生，而且动作都是持续性 的，此时用 _ 引导从句，而且主 句和从句都用 _ 时态。,过去进行,while,将下列汉语句子翻译成英语。,1. 当我正在网上查找信息的时候，门铃响了。 While I was looking for information on the Internet, the door bell rang.,2. 当我看见他的时候，他正在做一架模型飞机。 He was making a model plane when I