ket语法老师：2021年KP备考孩子一次性通过KET/PET考试并冲刺卓越

As, when和while都是连接词，但在某些情况下，它们之间也会有一些差异。

As, when or while

我们可以使用as， 当when和while表示“...“时间”，将两个事件同时发生：

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.

还可以使用as， when和while 在过去，用来表示背景事件：

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

我们用as连接同时发生的两件事。As之后，你可以用过去/过去的时间，用过去的时候强调一件事打断了另一件事，或者在另一件事正在进行的时候发生。

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

我们可以使用when来介绍一个单一的、完成的事件发生在一个漫长的事件中间。在这种使用下，我们通常在主句中使用它来描述更长的背景事件:

He was walking back to his flat when he heard an explosion.

按照前后文，when可以表示“after”这个意思，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）

在同一时刻，我们经常使用just和when连来表达事情：

The phone always rings just when I'm closing the front door.

While

通常我们用while连接两个同时发生的事件，而且这两个事件持续时间更长：

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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一次性通过KET/PET考试，冲刺卓越高。

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