Relier Pairs Modal verbsVersion en ligne Small activity to practice modals for obligation par Adamaris Dominguez 1 Running isn't allowed until your leg is better. 2 It's essential that he loses weight. 3 Taking vitamins isn't essential. 4 It's essential she exercises every day. 5 Eating too much sugar isn't allowed. 6 Wearing a helmet is essential You must not run while your leg is healing. He has to lose weight. You mustn't eat too much sugar. She has to exercise every day. Everyone must wear a helmet. I don't have to take vitamins.