when he leave 和when he is leaving区别

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when he leave 和when he is leaving区别

when he leave 和when he is leaving区别
when he leave 和when he is leaving区别

when he leave 和when he is leaving区别
一个是离开了,一个是没离开,快要离开

when he leaves 时间状语从句, 表将来“当他离开的时候”
后者也可以用作名词性从句
I don't know when he is leaving. 我不知道他什么时候走。 (这里显然不可用第一种说法)