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As, when和while兩者都是連詞,但在某些前提下,三者也會有一點(diǎn)區(qū)別。
As, when or while
我們可以用as, when和while來表示“當(dāng)...同時發(fā)生的兩個事件:
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.
我們也可以使用as, when和while 背景事件在過去用于表示:
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同時發(fā)生的兩件事。As以后可以用過去時/過去時,用過去時更強(qiáng)調(diào)一件事打斷另一件事,or發(fā)生在另一個過程中。
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
我們可以用when介紹在較長事件中間發(fā)生的單個和完成的事件。在這種情況下,我們通常在應(yīng)用主句時描述較長的背景事件:
He was walking back to his flat when he heard an explosion.
根據(jù)前后文,when可以表示afterat 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)
我們常用just和when用來表達(dá)事情發(fā)生在同一時刻:
The phone always rings just when I'm closing the front door.
While
我們一般用while連接兩個事件同時發(fā)生,個事件持續(xù)時間較長:
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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