Ответ:
1. I must clean my room.
2. Stop watching TV. You must do your homework.
3. You mustn't play on the road.
4. She must help her grandparents in the garden.
5. You mustn't feed the animals at the zoo.
1. Their family invited everybody to the party last week.
2. We had dinner with my family yesterday.
3. His brother didn't drink coffee with milk yesterday.
4. Did you go to the gym yesterday?
5. I didn't write this competition yesterday.