剑桥MSE丨As, when or whil 连词的使用

As, when和while均为连接词。
但在某些情况下,也会有略微的差别。
一起来看一看这三个词的具体用法吧~
As, when or while
as, when和while来表示“当...时”,来连接同时发生的两事件:
Another family arrived as we were leaving.
我们正要离开时,又来了一家人
When my father was out working in the field, I helped with milking the cows, feeding the pigs.
父亲外出下地干活时,我帮忙挤牛奶,喂猪。
也可以用as, when和while + 过去进行时,用来表示背景事件:
As she was leaving the court, a crowd of photographers gathered around her.
当她离开法庭时,一群摄影师围住了她。
Steven was very unhappy when things weren't going well for him.
当事情不顺利时,史蒂文很不高兴。
As
用as连接发生在同一时间的两件事情。As后可以使用过去时/过去进行时,使用过去进行时更加强调其中一件事打断了另一件事,or在另一件事正在进行的过程中发生。
As she walked to the door, she thanked them for a lovely dinner.
当她走到门口时,她感谢他们丰盛的晚餐。
As they were signing the contract, they noticed that a page was missing.
当他们签署合同时,他们注意到少了一页。
When
when来引入在一个较长事件中间发生的单个的、已完成的事件。在这种用发下,我们通常在主句中使用进行时来描述较长的背景事件:
He was walking back to his flat when he heard an explosion.
当他听到爆炸声时,他正走回他的公寓。
根据上下文,when既可以表示“after”的意思,也可以表示“at the same time”的意思:
When(=After)you open the file, check the second page.
当你打开文件后,检查第二页。
I eat popcorn when I am watching TV. (=at the same time)
我看电视的时候吃爆米花。
常用just和when连用来表达事情在同一瞬间发生:
The phone always rings just when I'm closing the front door.
电话总是在我正要关前门的时候响。
While
while连接两个同时发生的事件,且两个事件持续时间较长:
We spent long evenings talking in my sitting-room while he played the music he had chosen and explained his ideas.
我们在我的客厅里聊了好几个漫长的夜晚,他演奏着他选择的音乐,解释着他的想法。
We were lying on the beach sunbathing while they were playing volleyball.
我们躺在沙滩上晒太阳,而他们在打排球。

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