Ответ:

  1. Am I writing a letter now?
  2. Are we playing the piano?
  3. Are they watching a play now?
  4. Is she listening to pop music?
  5. Is my dad driving a car?
  6. Are you repairing your car?

В вопросительной форме Present Continuous форма глагола to be ставится перед подлежащим.