Ответ:

  1. I go to school five days a week.
  2. I don't go to school on Saturdays and Sundays.
  3. My brother doesn't go to school.
  4. My sister gets up at 8 o'clock.
  5. I get up at 7 o'clock.
  6. We usually have breakfast before school.
  7. Nick always has lunch at school.

Правило: в Present Simple с he, she, it глагол получает окончание -s, а в отрицании используется doesn't и смысловой глагол без окончания. С I и we употребляется начальная форма глагола.