有多少种状语从句？请一一列举

状语从句

一 定义：
A 状语主要是用来修饰动词和形容词的，以表明动作发生或状态存在的时间，地点，原因，等。

1 Ten years ago, She began to live in Dalian.
时间状语修饰began

2 The boy was praised for his bravery.
原因状语修饰
was praised

B 状语从句就是用一个句子来代替上面的时间状语和原因状语。

1 Ten years ago, she began to live in Dalian.
When she was 12 years old, she began to live in Dalian.

2 The boy was praised for his bravery.
The boy was praised because he saved the baby’s life in the freezing river.

二 状语从句的种类：

A 时间状语从句:

连接时间状语从句的连接词有:

(1) 连词：when, while, as. 它们都表示当…时候的意思。如果主句和从句的动作同时发生且都是进行时
态，只用while, as. 其他情况下when, while, as通用。

1 When he came in, I was listening to the radio．

2 As I was wandering in the street, I met her.

3 While (as) I was watching TV, my mum was cooking in the kitchen.

(2) 连词before, after, since, until(till). 当他们表示时间时