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when引导的时间状语从句是怎样的?

when引导的时间状语从句是怎样的?举例

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2019-03-31

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    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。

2019-03-31

266 0
    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。

2019-03-31

234 0
当我干什么的时候

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