作业帮I don't know when to leave为什么when后面要加to.
来源：学生作业帮助网 编辑：作业帮 时间：2024/09/03 10:31:45
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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