1. My brother DIDN'T PLAY tennis yesterday. He PLAYED tennis the day before yesterday.
2. My sister WASN'T PLAYING the piano at four o`clock yesterday. She WAS PLAYING the piano the whole evening.
3. When I came into the kitchen, mother WAS COOKING.
4. She WAS COOKING the whole day yesterday.
5. We WASHED the floor in our flat yesterday.
6. We WERE WASHING the floor in our flat from three till four yesterday.
7. DID you DO your homework yesterday?
8. WERE you DOING your homework from eight till ten yesterday?
9. Why WAS she SLEEPING at seven o`clock yesterday?
10. He WAS SITTING at the table the whole evening yesterday.