Răspuns:
1. Carlo has to go to school on Saturdays.
2. Dan doesn't have to go to school on Saturdays.
3. Dan has to stand up when a teacher comes into the classroom.
4. Carlo doesn't have to sing at the school assembly every morning.
5. Dan and Carlo have to switch off their mobile phones in lessons.
6. Carlo has to study every day.
7. Dan doesn't have to study every day.
8. Dan and Carlo have to take their books to school.