谁也不知道。

Nobody knows.

No one knows.

Source: Tatoeba

Sentence Composition

1 谁 shéi
  1. who
  2. also pr. shuí
2 也不 yěbù
  1. neither
  2. nor
3 知道 zhīdào
  1. to know; to become aware of
  2. also pr. zhīdao