不知

In a sentence

• 我不知如何是好。

  I do not know what to do.

  Here, '不知' (do not know) conveys the speaker's confusion or uncertainty.

• 他不知什么时候来了。

  He came without me knowing when.

  In this sentence, '不知' indicates the lack of knowledge about the subject's actions or timing.

• 不知未来会怎样。

  No one knows what the future will bring.

  Here, '不知' represents a philosophical expression about the unpredictability of the future.