How do you say “I don’t understand” in Vietnamese?

How do you say “I don’t understand” in Vietnamese?

I don’t understand:

  • Tôi không hiểu.
  • Anh không hiểu.
  • Chị không hiểu
  • Em không hiểu.

Tôi: I (formal)

Anh: I (speaker is a man who is old enough to be the listener’s older brother.)

Chị: I (Speaker is a woman who is old enough to be the listener’s older sister.)

Em: I (Speaker is a person young enough to be the listener’s younger sibling.)