Помогите решить задание по Active voice. Можно просто что в

1. are you doing, am looking 2. goes 3. are writing 4. have been writing 5 I (have just received) a letter from him. 6. We (have not met) sInce we left
7. is speaking 8 I (will have spoken) to him before 9.  became clear as soon as he (had received) 10. When I came, were discussing, 11. had been discussing 12. was raining hard when I (left) the house. 13. Tomorrow at 10 o'clock we (will be writing) 14. When we (came) home she was still (making) dinner. 15. I (have been trying) to explain it to you for an hour, but you (are not listening) to me. 16. When did he (come)? - He (came) 10 minutes ago.
17. Have they (got) a car? - Yes, they (have had) a car for 2 years already.
18. My brother (has been teaching) at school since 1995. 19. When will you (be) there tomorrow? - I (was) there at 10 o'clock. 20. We (were waiting) for you at 10 o'clock tomorrow. 21. They (will have finished) their work by last Monday.