you must finish your homework before tonight.
we must hurry since we are running late.
Tell them that they must get this done in order to receive credit.
To understand the DCF models is a must for banking industry.
I must do this however hard it is.
You mustn't cross that line.
We mustn't irritate him, otherwise we would pay for our impudence.
She mustn't marry him, for they are brother and sister.
Mustn't we write this down to let them know the information beforehand?
I mustn't fall into the temptation.