It's forbidden. You...do it!
mustn't
We...hurry. We have a lot of time.
don't have to
The museum is free. You...pay.
don't have to
I...wear a tie; I do it because I like wearing ties.
don't have to
You...apologize; it isn't necessary.
don't have to
You..feed animals at the zoo.
mustn't
Angela, you...leave your clothes all over the floor like this.
mustn't
You...go now; you can stay a bit longer.
don't have to
Do you...work next weekend?
have to
I...speak English well. I need it for my job.
have to
I...hurry up if I want to be at the office on time.
must
Students...wear uniforms at school.
have to
You...put salt in her food; the doctor said she can't eat salt.
mustn't