Вставить модальный глагол to have to в предложения Mary....go to school

Модальный глагол to have to в прошедшем времени имеет форму had to, в истинном - has to (he, she, it) либо have to (I, we, you, they), в будущем will have to.

Mary has to go to school by bus, so she leaves home at 8 oclock. Yesterday I had to get ready for my English exam. Last week my friends will have to stay at school after classes. Tomorrow he will have to go to bed at 9 oclock.