I saw him while he was crossing the street 与 He was crossing the street when i saw him 有什么区别

问题描述:

I saw him while he was crossing the street 与 He was crossing the street when i saw him 有什么区别

意思完全一样:他正过马路时我看见了他.解释下 谢谢第一句while用法:当...时候第二句when用法,可以为:正当...的时候....