Напишите 10 предложений с модальным глаголом must

You must to go to sleep.
She mustn't go to the cafe.
He must to win.
They must to smile in the stage.
Why do you must to buy this thing?
You mustn't cry.
It is so beautiful dress!You must buy it!
He must to study good!
Andrew must have only good marks.
Do you must to study English?