你們認識嗎？

Do you know each other?

Do you guys know each other?

Source: Tatoeba

Sentence Composition

1 你們 nǐmen you (plural)
2 認識 rènshi
  1. to know
  2. to recognize
  3. to be familiar with
  4. to get acquainted with sb
  5. knowledge
  6. understanding
  7. awareness
  8. cognition
=3 嗎 má (coll.) what?
=3 嗎 mǎ used in 吗啡 mǎfēi
=3 嗎 ma (question particle for "yes-no" questions)