Unit 8 when, while, as 用法语法资料2026-2027学年译林版八年级英语上册

本初中英语讲义聚焦when, while, as的用法这一核心知识点，通过表格系统对比三者在时间范围（时间点/时间段）和从句动词特点（短暂性/延续性）的基础区别，进而构建与过去进行时搭配的三大句型（长动作背景、同时持续动作、长动作中突发短动作）的学习支架。 该资料以结构化对比（表格+正误例句）和分层强化练习（选词填空、句型改写等）为特色，助力学生在分析连词差异中提升思维品质，通过多样化练习发展语言能力与自主学习能力。课中辅助教师清晰授课，课后学生可依托练习查漏补缺，巩固知识应用。

Unit 8 when, while, as 用法语法资料 一、基础区别📌 三个连词都译作“当……时候”，核心差异在从句动词： 连词 时间范围 从句动词特点 when 既可指时间点，也可指时间段 动词可以是短暂性动词，也可以是延续性动词 as 既可指时间点，也可指时间段 动词可以是短暂性、延续性动词 while 只指一段时间（过程） 从句谓语只能用延续性动词，不能接短暂动作 > 例句对比： > ✅ When/As he woke up, it was eight o’clock.（wake up是瞬间动作，时间点） > ❌ While he woke up, it was eight o’clock. > ✅ When/While/As I was waiting for a bus, I met her.（wait延续性，时间段） 二、三大常用句型（和过去进行时搭配） 句型1：长动作作为背景，突然发生短动作 > 一般过去时 + when/while/as + 过去进行时 过去进行时描述正在进行的长动作（背景）；一般过去时描述突然插入的短暂动作。连词可放句首或句中。 1. It began to rain heavily when/while/as we were having dinner. 我们在吃晚饭时，开始下起大雨。 2. When/While/As we were reading, a stranger came in. 当我们正在看书时，一个陌生人走了进来。 句型2：两个动作同时持续进行（两件长动作并行） > 过去进行时 + while + 过去进行时 只能用while，连接两个都在持续发生的动作。 1. They were rowing boats while we were climbing the hill. 当我们在爬山时，他们在划船。 2. While she was making a phone call, I was writing an email. 当她在打电话时，我正在写一封电子邮件。 句型3：长动作过程中，突然爆发短动作（when的特殊用法） > 过去进行时 + when + 一般过去时 主句是持续长动作，when从句引出突然发生的意外、突发动作，此处不能用while。 - I was walking in the street when he called me. 他打电话给我时，我正走在街上。 三、分层强化练习题 Ⅰ. 选词填空（when / while / as） 1. ________ he arrived, we were having class. 2. ________ my mother was cooking, my father was reading newspapers. 3. ________ I was riding home, I saw a cat. 4. I was doing my homework ________ the light went out. Ⅱ.单项选择 1. ______ Tom was sleeping, his brother came back home. A. While B. As soon C. Until D. Since 2. I was reading books ______ the telephone rang. A. while B. when C. though D. if 3. Which sentence is wrong? A. When he got home, we were sleeping. B. While he got home, we were sleeping. C. As he got home, we were sleeping. D. While we were sleeping, he got home. 4. ______ my sister was doing homework, I ______ playing games. A. When; was B. While; was C. While; am D. When; were 5. He was walking along the river ______ he heard someone shouting for help. A. while B. when C. as D. since Ⅲ.句型改写 1. I was doing housework. My friend visited me.（用when合并句子） ________________________________________________ 2. My mum was washing clothes. I was doing my homework.（用while合并两个进行时） ________________________________________________ Ⅳ.改错（划出错误，写出正确形式） 1. While he left the room, everyone looked at him. ________________ 2. When we were talk, the teacher came in. ________________ Ⅴ.翻译句子 1. 当我到家的时候，我的姐姐正在洗澡。 ________________________________________________ 2. 我正在公园里散步，这时天开始下雨。 ________________________________________________ 3. 当爸爸在看报的时候，妈妈正在做饭。 ________________________________________________ Ⅵ.判断正误T/F ( )1. while后面从句可以接短暂性动词，如arrive、wake up。 ( )2. “过去进行时 + when + 一般过去时”，用来表示长动作中突发短动作。 ( )3. 两个同时延续的长动作，优先用while连接。 ( )4. when和as既可以接时间点，也可以接时间段。 参考答案 Ⅰ.选词填空 1. When/As 2. While 3. When/As 4. when Ⅱ.单项选择 1.A 2.B 3.B 4.B 5.B Ⅲ.句型改写 1. I was doing housework when my friend visited me. 2. While my mum was washing clothes, I was doing my homework. Ⅳ.改错 1. While → When/As 2. talk → talking Ⅴ.翻译句子 1. When I got home, my sister was taking a shower. 2. I was walking in the park when it began to rain. 3. While Dad was reading newspapers, Mum was cooking. Ⅵ.判断正误 1.F 2.T 3.T 4.T 学科网（北京）股份有限公司 $