xiayutian200
幼苗
共回答了20个问题采纳率:100% 举报
下面是我从别处找来的,希望对你有帮助:
when的用法
1.当主句使用持续性动词时.
Dave was eating,when the doorbell rang.门铃响时,大卫在吃饭.
2.一个动作紧接着另一个动作发生.
When the lights went out, I lit some candles.灯灭了,我赶紧点上一些蜡烛.
3.谈论生命中的某一阶段,或过去的某段时间.
His mother called him Robbie when he was a baby.
在他很小时,他妈妈叫他Robbin.
4.指"每一次"
When I turn on the TV, smoke comes out the back.
每当我打开电视,就有烟从后面冒出.
while/as
从句多为进行时,而且为持续性动词.
I'll look after the children while you are making dinner.
你做饭,我来照顾孩子.
注意事项:
1.在某件事情正在进行的当中,发生了另一个事情,可用as,when或while
As/When/While Dave was eating,the doorbell rang.
2.在下列情况下,使用when,as而不用while
A.谈论两个同时发生的较短事件,或者一个事件紧接着另一事件发生,特别是当一个引发另一个时.
You'll see my house on the right as/when you cross the bridge.
你过桥就能看到我家.
As/When the can is opened, the contents heat automatically.
罐子打开后,里面的东西自动加热.
B.当表达"一个事情变化的同时,另一个事情也在变化"用as
Her eyesight wosened as she grew older.随着一天天变老,她的视力越来越差.
3.在两个动作同时进行时,用as或while,不用when
I went shopping while/as Linda cleaned the house.
我去购物,琳达打扫房子.
4.当从句为主系表结构时,as常表示原因,此时为了避免混淆,用when或while而不用as.
While/When you were playing golf, I went to the cinema.
你打高尔夫球时,我去看电影了.
(不能用as,否则就有可能被解为"因为你正打高尔夫球,所以我就去看电影了)
1年前
5