I don't know when she_（return）,but when she_（return）I___

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/07/09 08:48:40

I don't know when she___（return）,but when she___（return）I___（let） you know.
第二个return可以用“will return”吗?为什么?

I don't know when she_will return__（return）,but when she_returns__（return）I_will let_（let） you know.
不能换成will return.因为是是时间状语从句,主将从现的原则,从句用一般现在时代替将来.

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