我只是沒注意。

I just wasn't paying attention.

Source: Tatoeba

Sentence Composition

1 我 wǒ
  1. I
  2. me
  3. my
2 只是 zhǐshì
  1. merely; only; just; nothing but
  2. simply
  3. but; however
=3 沒 méi (negative prefix for verbs) have not; not
=3 沒 mò
  1. drowned
  2. to end
  3. to die
  4. to inundate
4 注意 zhùyì to take note of; to pay attention to