Помогите пожалуйста.Раскройте скобки,употребляя Pat Indefinite or Past Continuous,...

Question

Помогите пожалуйста.Раскройте скобки,употребляя Pat Indefinite or Past Continuous, Present Indefinite or Present Continuous
1.what you (to do )while I (to write) the letter yesterday?
2. Where is Steve? He(to prepare) for the new trial in the next room.
3. I (not to understand) what Mr. Green (to do).
4. Something (to smell) good. Are you making pancakes?
5. Look at the timetable. I think I (to hear) the bus.
6. Charles (to look) just like his father.
7. The secretary (to come) in and (to say) that a visitor (to wait) for me in the hall.
8. What you (to do) between 9.00 and 10.00 yesterday? -(to ask) the detective.

Answer 1

1. What were you doing while I was writing the letter yesterday?
2. Where is Steve? He ispreparing for the new trial in the next room.
3. I don't understand what Mr. Green is doing. 
4. Something smells good. Are you making pancakes? 
5. Look at the timetable. I think I hear the bus.
6. Charles looks just like his father.
7. The secretary came in and said that a visitor was waiting for me in the hall. 
8. What were you doing between 9.00 and 10.00 yesterday? - asked the detective.