1. Yesterday morning I helped my mother about the house.
2. My little brother didn't clean his teeth yesterday.
3. Did you go to the cinema last Sunday?
4. I thanked my mother after dinner.
5. My friend didn't play chess with me last week.
6. With whom did you go to school yesterday?
7. We had breakfast at 8 o'clock yesterday.
8. Did you eat a watermelon last summer?
9. I didn't drink coffee with milk yesterday.