as when while的区别 语法有什么不同

as when while的语法不同，when：when的基本意思是“什么时候”。可用作疑问副词,用来询问某事曾发生或将要发生的时间,引导特殊疑问句。while：while还可引导让步状语从句,意思是“虽然,尽管”,含有对比意味。As：as用作副词时主要用来表示比较,意思是“像…一样；如同”。

as when while的区别

As, when和while是连词。在一些用法中，as, when和while的意思是相同的，但它们的意思也可能略有不同。我们用它们来引导从句。

我们可以用as, when和while来表示“在那个时间”，连接两个同时发生的事件:

Another coach-load of people arrived as we were leaving.

我们正要离开时，又来了一车人。

我们经常用它们和过去进行时连用来指代背景事件:

When the men were out working in the field, I helped with milking the cows, feeding the calves and the pigs.

当男人们在地里干活时，我帮忙挤牛奶，喂小牛和猪。

While he was working, he often listened to music.

当他工作时，他经常听音乐。

我们可以把as, when和while放在主句之前或之后。当它们出现在主句前时，我们用逗号:

As she was leaving the court, a crowd of photographers gathered around her. (before the main clause, followed by a comma)

as when while的例句

1、As it was getting very late, we soon turned back.

2、We must stop writing now, as I have rather a lot of work to do.

3、When at Rome, do as Romans do.

4、When a pencil is partly in a glass of water, it looks as if it were broken.

5、Play while you play.

6、Play while you play, and work hard while you work.

7、Work while you work, and rest while you rest.

8、Learn while you play and play while you learn.