8. was sitting
9. were you doing
11. are learning
12 is writing

8. When I saw him, he (sit)__had saw_____ asleep in a chair.
9. What you (do)__did____ at7 p.m yesterday?
10. My brother (write)___writes____ several plays.
11. We (learn) __are learrning_____English now.
12. He (write) ___is writing_____a long novel at present