You ..................wear a uniform in private schools but you .....................wear one in public schools
HAVE TO . DONT HAVE TO
You................smoke on public transport. It is against the law.
MUSTN´T
In ARGENTINA, you................vote for president every four years
HAVE TO
You..............clean the toilet. The maid is coming tomorrow to do that.
DONT HAVE TO - DONT NEED TO
She...............to go to school today. It is Sunday!
doesn't have to
She.................. go to school today. She has DENGUE!
MUSTN´T
You..............speak English in my class. It is my rule here!
MUST