我不知道，他也不知道。

I don't know and neither does he.

Source: Tatoeba

Sentence Composition

1 我不知道 wǒbùzhīdào I don't know.
2 他 tā
  1. (third-person singular) (since the early 20th century, usu. male) he; him; his
  2. (bound form) other; another; some other (as in 他日 tārì and 他人 tārén)
3 也不 yěbù
  1. neither
  2. nor
4 知道 zhīdào
  1. to know; to become aware of
  2. also pr. zhīdao