1-ое задание:
1. We have to study for the English test.
2. My sister had an accident yesterday. She has to stay in hospital for a week.
3. My parents work at weekends and I have to do the shopping.
4. James has to go to bed early before exams.
5. You have to write a letter to your grandparents.
6. I have to wear a uniform at school.
2-ое задание:
Из всех 6-ти примеров которые я увидела, все правильные за исключением пятого.
5. My friends don't have to do the test.
Перевод: Моим друзьям не нужно писать тест.
My friends – Мои друзья / поэтому ставится множественное число.