一般表达不可以做的事情的句型，都用祈使句。
如:
Don't jump in the living room.
Don't play balls in the room.
Don't skate in the room.
Don't fight in the room.
Don't sing loudly in the room.
Don't dance in the room.
Don't kick the ball in the room.
Don't swim in the room.
Don't speak loudly in the room.
Don't knock something in the room.
