My cousin will drive me to school today, but I don't know when we'll leave.

我的表弟今天会开车送我去学校，但我不知道我们什么时候出发。

youdao

I don't know what and I don't know when, but I know it's going to happen.

我不知道是什么，我不知道什么时候，但我知道它将会发生。

youdao

Allen is said to have been designing a new computer program recently, but I don't know when she will finish it.

听说艾伦最近在设计一个新的电脑程序，但我不知道她什么时候能完成。

youdao

I don't recall what I gotfor my first Christmas, and I don't know when I went onmy first outdoor picnic, but I do remember the first time I heardthe sweetest voice in the wide world.

VOA: standard.other

I don't know when I'll be back. But I'm very excited.

我不知道我什么时候能回来，但是我很兴奋。

I'm about to 实战 - SpeakingMax英语口语达人

I don't know about that. I am not so sure." But then, we realized that like when we walk out that door, it's the whole world again. So you get sucked up by your group, by your sort of identity.

我不知道，不是很确定，然后呢，我们就意识到走出那个大门，又是一个完整的世界，所以你就会,被你的团体，你的身份所束缚。

普林斯顿公开课 - 人性课程节选

We haven't seen any engineers and I don't know when it will get fixed.

BBC: BT blames bad weather for East of England repairs backlog

"I don't know when I'm going to be able to come back, " Corpuz says.

NPR: Gift Boxes Help Migrant Filipinos Keep Ties to Home

"I don't know when I'm not in a meeting, " he says.

WSJ: Where's the Boss? Trapped in a Meeting