Fill in: "have to" (or its negative form) in the Present Simple or Past Simple.Fill in: "have to" (or its negative form) in the Present Simple or Past Simple.
1)We ... come to school on Saturdays and Sundays.
2)A teacher ... correct a lot of exercise-books.
3)We missed the bus, so we ... take a taxi.
4)She ... do any homework because wasn't at school.