I don't know when he will be back. When he comes back, he will give me a call
这句话是陈述句，不能用问号，把？改成。就行了。
我不知道他是什么时候回来的【。】
亲~，不明白请追问，满意请采纳，愿合作愉快！
*I don't know when he will come backif he has returned, ...*I hear nothing of the date he will come backif he has returned, ...
*I am ignorant of the date he will come backif he has returned, ...
*I am insensible of the date of his returnif he has come back, ...
be unaware of
*I am in the dark about the date of his returnif he has come back, ...
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