我应该写信吗？

Do I have to write a letter?

Source: Tatoeba

Sentence Composition

1 我 wǒ
  1. I
  2. me
  3. my
2 应该 yīnggāi ought to; should; must
3 写信 xiěxìn to write a letter
=4 吗 má (coll.) what?
=4 吗 mǎ used in 嗎啡 mǎfēi
=4 吗 ma (question particle for "yes-no" questions)