)составить из этих предложений утвердительное, отрицательное, главный вопрос с оборотом used to. 1) they were very slowly. 2) we played football a lot when we were students.

1) Did they use to be very slowly? / They used to be very slowly. / They didn't use to be very slowly.
2) Did we use to play football a lot when we were students (or while being students). / We used to play football a lot when we were students. / We didn't use to play football a lot when we were students.