"I know not!" she hurriedly replied.

她匆匆地回答说：“我不知道！”

youdao

I know not what to do.

我不知道该怎么办。

youdao

"Nay, I know not," said the woman, "and you cannot see!"

“不，我不知道，”老太婆说，“你也看不见！”

youdao

I do not know what else to do but make the best of a bad deal and shake hands over it."

VOA: special.2009.06.27

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

I am not a Dead Head, I am not, you know, sort of like, the kind of fan that followed them around.

我不是个死脑筋，我不是那种能追随他们到天涯海角的粉丝。

精彩音乐会 - SpeakingMax英语口语达人

How far he will be able to keep to this wise resolve I know not.

BBC: Charles Darwin letters reveal his emotional side

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

WSJ: Film Review

He added that "the fact of the matter is that a sense of injustice exists because a life is simply allowed to continue, I know not as before, and Elysia's has ended".

BBC: Naomi Jones cleared of causing death by dangerous driving