1. Sara has to work at the weekend to meet the deadline.
2. We our have to clean classroom and water the plants.
3. Sally has to take the dog for a walk every morning.
4. I do not have to write an essay every week.
5. Jack has to do a lot of hard work.
6. Helen has to visit her aunt every week an help her about the house.
7. We do not have to go to school on Sundays.