when,while as区别
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发布时间:2022-04-26 06:37
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热心网友
时间:2022-06-24 19:08
回答如下:
1. 若某事正在进行时又发生了某事,我们可以用when,while和as。when, while和as引导的时间状语从句的谓语动词必须是延续性动词,主句谓语动词必须是短暂性动词。例如:
When / While / As I was walking down the street, I noticed a girl hit by a truck.
不过as引导的时间状语从句还可以用一般时。例如:
As I sat at the desk writing, I didn't notice her come in.
2. 若时间状语从句的谓语动词是非延续性动词时,不能用as和 while,可以用when。例如:
When we arrived at the school, it was nine o'clock in the evening.
3. 若主句和从句的两个动作是同时进行的长动作,通常用while,从句可用一般时或进行时。例如:
While the boy was watching TV / watched TV, his mother was doing the cooking / did the cooking.
4. 若表示两种正在发展、变化的情况,可以用as。例如:
As I get older, I get more optimistic.
As it grew dark, we were more and more worried about her safety.
5. 若是两个短动作,通常用as或just as, 也可以用when 或just when。例如:
Just as / when I opened the door, a strange man appeared in front of me.
热心网友
时间:2022-06-24 19:08
1.作“当…时”区别不大,属于比较,主观性的遣词造句范畴,
2.考试一般是在区别上考,while当转折比较,as当原因(as用法相当多了)这时它们就各不相同了。