时间状语从句中when怎样用,它引导的从句用什么时态
来源:百度知道 编辑:UC知道 时间:2024/05/11 14:58:18
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 wil