while和when如果都用于时间状语从句中,前者更多用进行时,表示主从句两个动作的同时进行,如:I was doing my homework while mother was preparing supper;而后者更强调在一件事情正在发生或即将发生的时候,另一动作发生。如:I was doing my homework when my father came in. / I was about to go out when the telephone rang.
此外,while可用来表示对比。如:I like football while my sister prefers pop music.
when有时译会“既然”,相当于now that用法。如:When you've already got a new job, why are you still not satisfied?
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