Ответ:

  1. What day do you have P.E.? — On Friday.
  2. How often do you play football? — Once a week.
  3. How do you go to school? — By bike.
  4. Which ball is that? — A tennis ball.
  5. Who is your P.E. teacher? — Ms Camara.
  6. Why do you go surfing? — Because it’s fun.

The question word is chosen according to the type of information in the answer: day, frequency, manner, object, person or reason.