as when while的區(qū)別 語法有什么不同

as when while的語法不同，when：when的基本意思是“什么時候”。可用作疑問副詞,用來詢問某事曾發(fā)生或將要發(fā)生的時間,引導特殊疑問句。while：while還可引導讓步狀語從句,意思是“雖然,盡管”,含有對比意味。As：as用作副詞時主要用來表示比較,意思是“像…一樣；如同”。

as when while的區(qū)別

As, when和while是連詞。在一些用法中，as, when和while的意思是相同的，但它們的意思也可能略有不同。我們用它們來引導從句。

我們可以用as, when和while來表示“在那個時間”，連接兩個同時發(fā)生的事件:

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

我們正要離開時，又來了一車人。

我們經(jīng)常用它們和過去進行時連用來指代背景事件:

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

當男人們在地里干活時，我?guī)兔D牛奶，喂小牛和豬。

While he was working, he often listened to music.

當他工作時，他經(jīng)常聽音樂。

我們可以把as, when和while放在主句之前或之后。當它們出現(xiàn)在主句前時，我們用逗號:

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.