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while引导的时间状语从句

2020-06-28 18:55:29  ·  青少儿英语指南

while引导的时间状语从句

时间状语从句就是用表示时间的连词连接一个句子作状语,常见地连接时间状语从句的连接词有:when, before, after, while, as, until, since…等等。其中while和when、as的用法常常被混淆。 While引导的时间状语从句.jpg 下面我们来看看它们之间的区别: (1) While 和 as 只能和延续性动词连用,而when既能够和连续性动词使用,也可以和终止性动词使用: I stopped eating when she came in. She walked in the room while I was eating. He came in as we were dancing.

(2) When从句的谓语动词可以在主句谓语动作之前、之后或同时发生;while和as从句的谓语动作必须是和主句谓语动作同时发生。例如: When I got to the airport,the guests had left. I was doing my homework while she was reading the book. The students took notes as they listened. 注意,当主句、从句动作同时进行,但是从句的动作时间淡化,主要表现主句动作发生的背景和条件时,只能用as,表示“随着……”之意。如: As years go by,China is getting stronger and richer.

(3) 如果从句和主句的动作同时发生,两句都用过去进行时的时候,多用while引导,如: They were singing while we were dancing.

(4) 一些情况只用when,不用while: 在将来时从句中,常用when,且从句须用一般时代替将来时,例如:You can borrow the book when I have finished reading it. 表示一……就……的句型:She had hardly entered the room when the phone rang.