Eating too much sugar isn't allowed.
Running isn't allowed until your leg is better.
It's essential she exercises every day.
Taking vitamins isn't essential.
It's essential that he loses weight.
Wearing a helmet is essential
You mustn't eat too much sugar.
She has to exercise every day.
He has to lose weight.
I don't have to take vitamins.
Everyone must wear a helmet.
You must not run while your leg is healing.