when he leave 和when he is leaving区别

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whenheleave和whenheisleaving区别whenheleave和whenheisleaving区别whenheleave和whenheisleaving区别一个是离开了,一个是没离开

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)