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As, when和while都是連接詞,但在某些情況下,它們之間也會有一些差異。
As, when or while
我們可以使用as, 當(dāng)when和while表示“...“時間”,將兩個事件同時發(fā)生:
Another family arrived as we were leaving.
When my father was out working in the field, I helped with milking the cows, feeding the pigs.
還可以使用as, when和while 在過去,用來表示背景事件:
As she was leaving the court, a crowd of photographers gathered around her.
Steven was very unhappy when things weren't going well for him.
As
我們用as連接同時發(fā)生的兩件事。As之后,你可以用過去/過去的時間,用過去的時候強調(diào)一件事打斷了另一件事,或者在另一件事正在進行的時候發(fā)生。
As she walked to the door, she thanked them for a lovely dinner.
As they were signing the contract, they noticed that a page was missing.
When
我們可以使用when來介紹一個單一的、完成的事件發(fā)生在一個漫長的事件中間。在這種使用下,我們通常在主句中使用它來描述更長的背景事件:
He was walking back to his flat when he heard an explosion.
按照前后文,when可以表示“after”這個意思,也可以表示“at the same time”的意思:
When(=After)you open the file, check the second page.
I eat popcorn when I am watching TV. (=at the same time)
在同一時刻,我們經(jīng)常使用just和when連來表達事情:
The phone always rings just when I'm closing the front door.
While
通常我們用while連接兩個同時發(fā)生的事件,而且這兩個事件持續(xù)時間更長:
We spent long evenings talking in my sitting-room while he played the music he had chosen and explained his ideas.
We were lying on the beach sunbathing while they were playing volleyball.
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