Раскройте скобки употребляя Past Indefinite или Past Continuous ,Present Indefinite или 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.

What  were you doing while I was writing  the letter yesterday? 2. Where isSteve? He is preparing for the new trial in the next room. 3. I do not understand what Mr. Green is   doing. 4. Something smells good. Are youmaking 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.