Ответ:

  1. She likes biology.
  2. Look! My brother is playing the guitar.
  3. We don’t play computer games every day.
  4. Fred always goes to school by bus.
  5. Are we cleaning a bedroom right now?
  6. I am not watching TV at the moment.
  7. Where is Jack? He is doing his homework.
  8. Jinny works in the garden every weekend.
  9. We are reading a book right now.
  10. Do they visit their parents every Sunday?
  11. Tom studies geography.
  12. Look! My brother is dancing with your sister.
  13. I sometimes run in the park.
  14. Is he playing football right now?
  15. We don’t play computer games every day.
  16. They aren’t cooking a pie at the moment.
  17. Is your sister washing dishes now?
  18. Where are our children? They are playing outside.
  19. Maria writes letters every Monday.
  20. You are buying a bicycle right now.

Present Simple is used for habits, routines and likes; Present Continuous is used for actions happening now.