I don't know when to leave为什么when后面要加to.

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Idon''tknowwhentoleave为什么when后面要加to.Idon''tknowwhentoleave为什么when后面要加to.Idon''tknowwhentoleave为什么when后面

I don't know when to leave为什么when后面要加to.
I don't know when to leave为什么when后面要加to.

I don't know when to leave为什么when后面要加to.
不定式结构作为句子成分起从句的作用.

to表将来

这是 疑问代词 + 不定式的用法
如:I don't know what to do. I don't know where to go. I don't know how to do. 等等。

:蝴蝶在云端
说的对