I have a test next week, so I must do my homework today.
You must find a new secretary.
I must lose two pounds this month.
John must study harder if he wants to enter the university.
You must listen to the teacher.
I must not talk about this, it is a secret.
You must not walk on the grass.
You must not smoke and drink alcohol!
Students must not leave the classroom before the bell rings.
You must not leave the house after 10!
We don't have to be in a hurry.
He doesn’t have to help me.
We don’t have to wear uniforms to school.
You don't have to eat it.
She doesn’t have to come to the party if she doesn’t want to.
