谢谢

什么叫时间状语从句？He was about to leave when the telephone rang为什么是时间状语从句？

什么叫时间状语从句？
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，他们既是介词又是连词。

{ He usually drinks a cup of tea before he goes to school.
　　　　　　　　　　　　　　　　　 连词
He usually drinks a cup of tea before going to school.
　　　　　　　　　　　　　　　　　介词
{
He usually drinks a cup of coffee after he comes back from school.
　　　　　　　　　　　　　　　　　 　连词
He usually drinks a cup of coffee after coming back from school.
　　　　　　　　　　　　　　　　　　　介词
{

I have lived in Dalian since my son was born in 1999.
　　　　　　　　　　　　 连词
通常情况下，主句用现在完成时，从句用一般过去时。
I have lived in Dalian since 1999.
　　　　　　　　　　　　　介词


{
I will wait here until(till) you finish your job.
　　　　　　　　　　　 连词
I will wait here until(till) 8pm.
　　　　　　　　　　　介词

(3) 词组：as soon as

{ I will tell him as soon as he comes back.
As soon as she finishes her homework, she will play tennis.
通常情况下，主句用一般将来时，as soon as 引导的从句用一般现在时。




He was about to leave when the telephone rang为什么是时间状语从句？
是when引导的时间状语从句。

[ 本帖最后由 teacherleehom 于 2012-3-17 09:25 编辑 ]