Ответ:
1. I read this book yesterday.
2. My sister cooked the dinner.
3. Mom came home five minutes ago.
4. I watered the flower yesterday.
5. My brother helped me on my homework.
6. My dog ate his food.
7. I went to school today.
8. I already did my homework.
9. My mother already read this newspaper.
10. I came home one hour ago.