12. I'm doing 13. are going 14. is sitting 15. is standing .... is smoking 16. is walking 17. is lying 18. Are you having a break? 19. What language are you studying? 20. Who is lying on the sofa? 21. What are they talking about? 22. It's still raining. 23. I'm opening an umbrella. 24. John is playing a computer games.