我在发呆。

I'm out of it.

Source: Tatoeba

Sentence Composition

1 我 wǒ
  1. I
  2. me
  3. my
2 在 zài
  1. to exist; to be alive
  2. (of sb or sth) to be (located) at
  3. (used before a verb to indicate an action in progress)
3 发呆 fādāi
  1. to stare blankly
  2. to be stunned
  3. to be lost in thought