( When he will come ) is not known.
( )内看做一个整体,也即【他什么时候回来】这个“问题”不被任何人知道,也就是没人知道.
所以用了被动.另外说一句这里 （）内句子充当名词,句子就当名词那么用,称为名词性从句,在你的句子里作为主语.
希望有点帮助吧..
When he will come is not known.为什么用被动语态?
3个回答
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