5 form, must/musn`t

You … eat and speak at the same time.

You … wash your hands before eating. 

You … lick your knife and put it in your mouth

You … eat with your fingers.

You … eat loudly.

You … use a napkin to clean your mouth.

You … leave the table while the others are still eating

You … sing or whistle while you are eating

You … try not to make a mess around your plate