一、定义

　　状语从句在复合句中由从句表示的状语称作状语从句，它可以用来修饰谓语(包括非谓语动词)、定语或状语，或是整个句子。

　　二、状语从句一般分为八大类

　　时间状语从句 地点状语从句

　　原因状语从句 目的状语从句

　　结果状语从句 条件状语从句

　　方式状语从句 让步状语从句

　　1. 时间状语从句

　　When ---当……时候, 通常指某一特定的时间点，主句与从句的动作同时发生。

　　When I opened the window, I saw him come up.

　　When --- 正在……的时候，突然…。通常主句是进行时或 be about to 时，在翻译的时候，when 可以译成没想到或突然。

　　I was walking along the street , when I met him.

　　When 当从句是进行时，主句是一般时，往往表示不满。

　　Someone knocked at the door when I was having breakfast.

　　When=after

　　When the children had gone to bed, she began to prepare her lessons.

　　While ---在……期间，往往指一段时间。

　　While we were inAmerica, we saw him twice.

　　While ---表示一种不满情绪，意思是这边在干某种重要的事，而另一边在享受等。

　　We are cleaning the classroom while they are playing the football.

　　As --- 一边……一边, 随着

　　She was doing her homework as she was listening to the music.

　　As --- 当……时，指一个动作紧接着一个动作发生，从句通常用进行时。

　　As I was going out, it began to rain.

　　The moment --- 一……就…… =as soon as , immediately,

　　---Did you remember to give Mary the money you owed her?

　　---Yes, I gave her the moment I saw her.

　　Not… until --- 直到……才

　　He didn’t leave the office until he finished the work.

　　Before --- 在……之前

　　The passengers should arrive at the airport an hour before the flight departs.

　　After --- 在…… 之后

　　The customer left the ticket counter after he had a quarrel with the ticket agent.

　　Since ---自从……, 通常主句用现在完成时

　　I have never been there again since I graduated from the university.

　　It is just a week since we arrived here.

　　As soon as --- 一……就……

　　Jack went to school as soon as he got well.

　　No sooner than --- 一……就……

　　no sooner… than… 用于句首要求倒装

　　Hardly …when…

　　Scarcely …when…

　　No sooner had he arrived than he went away again.

　　Once --- 一但……就……

　　Once you see him, you will never forget him.

　　Every time, each time 每次whenever 每当

　　Each time he came to town, he would visit our school.