when引导时间状语从句的用法口诀（when引导时间状语从句的用法）

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1、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。

2、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。

3、 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。

4、 { 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。

5、 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。

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