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.