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?

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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___（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___（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___（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.

不可以 英文I don't know when she__will_（return），的意思是我不知道他什么时候回来
而后面是），but when she___（return）I___（let） you know.他回来来了我会让你知道
所以都是回来了 所以不用will return
希望能帮到您

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