Ребята помогите! Просто не поняла тему( номер 4

You should arrive before the perfomance.
You ought to be quiet during the perfomance.
You should turn off your mobile.
.
You shouldn't touch the cirsuc animals.  You oughtn't to put your feet on the seats. You shouldn't bring your own food. You oughtn't to enter the cirsuc area.