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As, when和while两者都是连词，但在某些前提下，三者也会有一点区别。

As, when or while

我们可以用as, when和while来表示“当...同时发生的两个事件：

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.

我们也可以使用as, when和while 背景事件在过去用于表示：

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

我们用as同时发生的两件事。As以后可以用过去时/过去时，用过去时更强调一件事打断另一件事，or发生在另一个过程中。

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

我们可以用when介绍在较长事件中间发生的单个和完成的事件。在这种情况下，我们通常在应用主句时描述较长的背景事件:

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

根据前后文，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）

我们常用just和when用来表达事情发生在同一时刻：

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

While

我们一般用while连接两个事件同时发生，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.

We were lying on the beach sunbathing while they were playing volleyball.

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