初中英语时间状语从句讲解及练习教学内容

初中英语时间状语从句讲解及练习教学内容
初中英语时间状语从句讲解及练习教学内容

语法29 时间状语从句

一、什么是状语从句

状语就是在一句话中表示该句子的时间、地点、方式、原因、条件等成分。状语从句就是用一个从句表示状语。状语从句根据它表达的意思不同,可分为时间、地点、原因、目的、结果、条件、方式、比较、让步等九类。

与状语一样,状语从句的位置比较灵活。既可置于主句之前(通常用逗号与主句隔开),也课置于主句之后(不需要用逗号与主句隔开),有时甚至可以置于主句之中。

二、时间状语从句

1.主句和从句同时发生,这类从句由从属连词when, while, as引导。

He was hungry when he came home.

I was crying while everyone was laughing.

As I walked out, he walked in.

as, when, while, 的区别

①as强调从句的动作与主句动作同时发生及持续,具有at the same time的意思

他继续往下谈的时候,越来越兴奋。

as还可以表示一边……一边……,强调从句和主句中两个动作交替进行或同步进行。

他们边走边聊。

as还有“随着”的含义

随着春天的到来,天气暖和起来。

②when强调动作点的特定时间,具有at the time that的意思

当老师走进来的时候,我们都站起来了。

③while表示较长的期间,具有during the time that的意思

当我在这的时候,我很安全。

2.主句发生在从句之前,这类从句由从属连词before, until引导,before意为“在---之前”until 在肯定句中意为“直到---为止”,在否定句中意为“直到---才”。从句既可置于主句前,也可置于主句之后。

回家之前我必须干完所有的活。

我们将一直等到他回来。

他直到晚上11点才回家。

3.主句发生在从句之后,这类从句由从属连词after引导,意为“在---之后”。从句既可置于主句前,也可置于主句之后。

放学后我们踢足球吧。

4. 主句在从句之后立刻发生,这类从句由从属连词once, as soon as引导,意为“刚刚”,“一---就---”。从句既可置于主句前,也可置于主句之后。

他一有空就来看你。

一有消息,我就打电话给你。

三、if引导的条件状语从句

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