起初我不知道為什麼。

At first, I had no idea why.

Source: Tatoeba

Sentence Composition

1 起初 qǐchū originally; at first; at the outset
2 我不知道 wǒbùzhīdào I don't know.
3 為什麼 wèishénme
  1. why?
  2. for what reason?