Составьте фразы с модальным глаголом must в трех временах: 1.present simple, 2.future simple, 3 past simple. и формах 1.утвердительная, 2.вопросительная, 3.отрицательная.

1) She must do her homework.
Must she do her homework?
She must not do her homework.
2) They will have to help their teacher.
Will they have to help their teacher?
They won't have to help their teacher.
3) I had to pass the exam.
Did I have to pass the exam?
I did not have to pass the exam.