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比较while, when, as

1)as, when 引导短暂性动作的动词。

Just as / Just when / When I stopped my car, a man came up to me.

2)当从句的动作发生于主句动作之前，只能用when 引导这个从句，不可用as 或 while。

When you have finished your work, you may have a rest.

3)从句表示"随时间推移"连词能用as，不用when 或while。

As the day went on, the weather got worse.

日子一天天过去，天气越变越坏。

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