7. when i came into the kitchen, mother was cooking. 8. she was cooking the whole day yesterday. 9. we washed the floor in our flat yesterday. 10. we were washing the floor in our flat from three till four yesterday. 11. did you do your homework yesterday? 12. were you doing your homework from eight till ten yesterday? 13. why did she sleep at seven o’clock yesterday? 14. he was sitting at the table the whole evening yesterday. 15. what was nick doing when you came to his place? 16. what were you doing when i rang you up? 17. i didn’t sleep at nine o’clock yesterday.
