我不是正在寫信。

I am not writing a letter.

Source: Tatoeba

Sentence Composition

1 我 wǒ
  1. I
  2. me
  3. my
=2 不是 bùshì
  1. no
  2. is not
  3. not
=2 不是 bùshi fault; blame
3 正在 zhèngzài to be in the process of (doing sth); to be currently ...-ing
4 寫信 xiěxìn to write a letter