【百词斩】时间状语从句引导词细讲

上次，我们梳理了状语从句的概念，开启了它的大门。可万万没想到：里面还有9个小房间，分别住着

时间、地点、原因、条件、目的、结果、让步、方式和比较状语从句

<(￣︶￣)>没见过大世面的小编不知如何是好，只有挨个摸索其中的考点啰！

所以，今天我们打开的是时间状语从句之门，学习when/while/as三者的区别：


一、when/while/as考点讲解：

1). when既可以接长动作（持续性动作），也可以接短动作（瞬间动作），可用于主句和从句动作同时发生，或从句动作先于主句动作。

When she came into my room, I was just reading a book. 

When he was a child, he was always trying out new ideas.

2). while引导的动作必须是长动作（持续性动作），侧重主句动作和从句动作之间的对比。

While they were talking, the bell rang. 

While my wife was reading the newspaper, I was watching TV. 

3). as可表示从句和主句的两个动作交替进行或同时完成，译为“一边...一边…”或“随着......”。

The little girls sang as they went away. (一边...一边)

As the day went on, the weather got worse. (随着)


二、注意：when的特殊用法！！！

when意为“正要做某事时，突然......”，常见句型有：

1.be about to do...when...

2.be on the point of doing...when...

3.be doing...when...

Eg:
Tom was about to close the window when his attention was caught by a bird.

He was on the point of leaving when someone knocked at the door.

We were doing homework when my mom came in.


小编寄语：when/while/as考点总结

1)表两个动作的对比，只能用while；

Eg: While my brother was watching TV, my sister was cooking.

2)引导短暂性动作的词用as, when；

Eg: As/When I stopped my car, a man came up to me.

3)当从句的动作先于主句动作发生，只能用when ；

Eg: When you have finished your work, you may have a rest.

4)从句表示“随着”和“一边...一边”之意，能用as。

Eg: As years go by, China is getting stronger and richer. (随着)

The students took notes as they listened. (一边...一边)

--摘自：百词斩