He isn't speaking at this moment yet. He isn't yet producing language.

那个时候他还不会说话，他还不知道什么语言。

耶鲁公开课 - 弥尔顿课程节选

I chose English Literature because when I started off a university, I didn't know what it was I wanted to do.

我选英语文学是因为当我刚上大学的时候，我不知道自己到底想做什么。

为何选那门专业？ - SpeakingMax英语口语达人

So in the fourth stanza we as readers have no idea where we are or when it is the speaker of the poem imagines himself to be speaking, and it's at this point that something quite strange happens.

所以作为读者，对第四段我们不知道,自己在哪，诗的代言者在哪,什么时候想说话，而且就是在这时非常奇怪的事情发生了。

耶鲁公开课 - 弥尔顿课程节选

Please don't anybody tell me late - any time after today you didn't know when the mid-term was and therefore it clashes with 17 different things.

所以以后千万别跟我说,你不知道什么时候期中考试,然后还在考试那天安排大一堆事儿去做

耶鲁公开课 - 博弈论课程节选

So you've got to understand when it's okay and when it's not okay.

你必须得知道,什么时候可以,什么时候不可以

耶鲁公开课 - 基础物理课程节选

The fact that you could die and you don't know when you're going to die doesn't yet entail that you could die at any minute, at any moment.

你可能会死和你不知道,自己什么时候会死这个事实并不能得出,你可能随时随刻死的结论。

耶鲁公开课 - 死亡课程节选

Now, I don't know how far back it goes but it must be that in ancient times some people would say, all right you're going to be doing more work or you're contributing more to this enterprise, we'll give you a bigger share of the profits.

我不知道这能追溯到什么时候,但在古时候肯定有人说,好吧,你比别人干得多,你对公司的贡献更大,我们会把收入的大头给你

耶鲁公开课 - 金融市场课程节选

You don't know.

你不知道什么时候中奖。

耶鲁公开课 - 心理学导论课程节选

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 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

The moral is that reciprocity is friendship and so good, all to the good, but as I say there's a moment of suspense in the expectation at the point in the text when we expect a moral but we don't know what the moral is going to be.

寓意是，相互关爱就是友谊，它如此美好，对双方都有好处，但正如我所说，也有那么一刻，期望面临悬念,在当我们期待一个寓意,却不知道那个寓意将是什么的时候。

耶鲁公开课 - 文学理论导论课程节选