We must respect the elderly.
We must do our chores.
You must go outside, you've been here for too long.
I must go home now, my mom called.
He must obey the rules. He has no choice.
We mustn't swear.
We mustn't run on halls.
You mustn't say rude words.
He mustn't go outside because he's sick.
She mustn't go there, it's forbiden.
