Respuesta:
1. I play (play) tennis every Saturday and Sunday.
2. He usually goes (go) to work by bus.
3. My sister is making (make) a cake at the moment.
4. Mary is preparing (prepare) dinner at the moment.
5. Carl plays (play) basketball every day.
6. I am using (use) the computer now.
7. Listen! John is playing (play) the violin.
8. I always do (do) my homework after school.
9. I am cooking (cook) for my mother now.
10. My father always drives (drive) slowly.
