Unit 5 What were you doing when the rainstorm came？-2020-2021学年八年级英语下册语法知识归纳（人教版）

v Unit5 What were you doing when the rainstorm came? 过去进行时 ①过去进行时的结构： 1.肯定句：主语+was/were+现在分词+其他。 2.否定句：主语+wasn't/weren't+现在分词+其他。 3.疑问句：Was/Were+主语+现在分词+其他？ 4.特殊疑问句：疑问词+was/were+主语+现在分词+其他？ e.g. We were watching TV when our parents came back home.(变否定句，疑问句，并对划线部分提问） We weren’t watching TV when our parents came back. Were you watching TV when your parents came back? What were you doing when your parents came back? Tip：在过去进行时中，he/she/it was 不可缩写 ②过去进行时的用法： 1.过去进行时表示过去某一时刻正在进行的动作。 e.g. I was washing dishes at half past eight last night. 2.表示过去某一时间段内一直在进行的动作。 e.g.My mother was cleaning the house all day yesterday. 3.表示一个动作发生时，另一个动作正在进行。 e.g.I was doing my homework when my mother came back home. 4.表示两个动作同时进行，这时可用while连接 e.g. My parents were watching TV while I was listening to music. 5.表达特定情感，与现在进行时相似，过去进行时也可表示满意，称赞，惊讶，厌恶等情感，通常和always等副词连用。 e.g.They were always singing at night.(他们总是晚上唱歌） Girls were always changing their minds.(=女生总是很善变） ③ 过去进行时常用的时间状语 at that time 当时 at that moment 那时 the whole morning 整个上午 at +时间点+yesterday this time yesterday 昨天这个时候 从属连词when(当...时），while（当...时）在时间状语从句中的使用 时间状语从句：在句中作时间状语的从句称为时间状语从句，时间状语从句可以放在句首，句中和句尾。引导时间状语从句的连词主要有：when,while,as,before,since(自从),after,until/till(直到...为止），as soon as（一...就..）等。本单元主要学习when/while在时间状语从句中的使用。 ①when/while的共同用法 when/while 都可以引导时间状语从句，意为“当....时”。若表示主句中的动作和从句中的动作同时发生，且从句的谓语动词是延续性动词，它们可以互换。 When/While we were dancing,our teacher came in. 当我们跳舞的时候，我们的老师进来了。 延续性动词 ② When/While的用法区别 1.When引导的时间状语从句的谓语动词既可以是延续性的，也可以是非延续性，而while引导的时间状语从句的谓语动词只能是延续性的。 e.g.When my friend came in, I was doing my homework. 非延续性动词 While we were playing basketball,they were playing footb all. 延续性动词 2.while 表示从句的动作与主句的动作同时发生，而when表示从句的动作发生在主句的动作之前/之后/也可同时发生。 e.g. While/When the children were sleeping, the teacher prepared the next lesson. (同时发生） When I had finished my homework， I went out with my friends.