when引导的时间状语从句是怎样的?举例

when引导的时间状语从句是怎样的?举例
when引导的时间状语从句是怎样的?举例

when引导的时间状语从句是怎样的?举例
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.

当我干什么的时候

when it is 10:00,i will go out .
when they arrived,it rained.

when可以和延续性动词连用，也可以和短暂性动词连用；而while和as只能和延续性动词连用。 ① Why do you want a new job when youve got such a good one already？（get为短暂性动词）你已经找到如此好的工作，为何还想再找新的？ ②Sorry，I was out when you called me．（call为短暂性动词）对不起，...

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when可以和延续性动词连用，也可以和短暂性动词连用；而while和as只能和延续性动词连用。 ① Why do you want a new job when youve got such a good one already？（get为短暂性动词）你已经找到如此好的工作，为何还想再找新的？ ②Sorry，I was out when you called me．（call为短暂性动词）对不起，你打电话时我刚好外出了。 ③Strike while the iron is hot．（is为延续性动词，表示一种持续的状态）趁热打铁。 ④ The students took notes as they listened．（listen为延续性动词）学生们边听课边做笔记。
when常与以下结构连用：
1.be doing+ when表示“正在做某事。。。突然。。。”
Iwas doing my homework when the light went out.
我正在写作业突然停电了。
2.be about to do sth+ when表示“正要做某事。。。突然。。。”
I was avout to go out when the telephone rang.
我正外出电话就响了。
3.had done +when表示“刚做完某事。。。突然。。。”
I had just entered the house when it began to rain.
我刚进门就下雨了。

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