You come and buy in the market and go back to your homes laden with goods, but the spell of the homeless winds has touched me I know not when and where.

你到市场采买，满载着回家，但不知从何时何地一阵无家之风吹到我身上。

youdao

I know not what the younger dreams—some vague Utopia—and she seems, when withered old and skeleton-gaunt, an image of such politics.

我不知道年轻一代的梦想是什么——某种模糊的乌托邦——而当她憔悴衰老、骨瘦如柴时，她似乎就是这种政治的化身。

youdao

"Perhaps not," Alice cautiously replied, "but I know I have to beat time when I learn music."

“也许不，”爱丽丝小心地回答，“但我在学音乐的时候，总是按着时间打拍子的。”

youdao

"One soldier had been fighting in the jungles for years. And I don't know if it had affected him or not, but when the clerk handed him a tweed suit to try on he spent three hours searching through the fuzz for snipers."

VOA: special.2009.03.09

I know not what the younger dreams-- Some vague Utopia--and she seems, When withered old and skeleton-gaunt, An image of such politics.

我不知年幼者梦想什么-,某种模糊的乌托邦--她仿佛，当枯萎衰老瘦骨嶙峋的时候，这类政治的一个鬼影。

耶鲁公开课 - 现代诗歌课程节选

So it's not to be used when you just feel sort of "Nahhhh, I don't know."

所以，当你仅仅是觉得“嗯……我不清楚”的时候，不能用这个句型。

I hate 课堂 - SpeakingMax英语口语达人

But at least I know I'm not alone when I lie to my kids in the name of good parenting.

NPR: Hide the Hot Fudge

And I honestly do not know when we depart on Thursday, but I should figure that out because I've got to pack.

WHITEHOUSE: Press Briefing

Here is all I know about football: I know not to bother my husband when the Giants are playing.

WSJ: Film Review