I do not know when I will be back.

真不知道何时能回来。

youdao

I have no idea when I will be back from Shanghai.

我不知道我什么时候从上海回来。

youdao

I also hope that we can meet in person when I will be back.

我也希望我们能满足人的时候我会回来的。

youdao

"I think it's another thing when you sit back and retire and you see how many perfect games have been thrown in history and your name is in there, I think that's when I will sit back and kind of be surprised."

VOA: standard.2009.12.24

"I've no idea when I will be back, " he said.

BBC: Ruthin's Glasdir estate floods 'answers still needed'

"I've heard three contradictory answers as to when I will be able to go back home, " Hale said.

CNN: Arkansas AG to investigate oil pipeline leak

When I come back, hopefully it will be a good game and hopefully I will enjoy it.

CNN: Zlatan Ibrahimovic rejects 'bad boy' tag