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 this is going to get aired

我不知道这个录像什么时候播出，

我们是校园情侣 - SpeakingMax英语口语达人

I don't know what that dream we're going to dream together is when we read that novel. I don't know what that'll be.

我不知道当我们一起读那部小说的时候,我们将会一起做个什么样的梦，我不知道。

耶鲁公开课 - 1945年后的美国小说课程节选

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