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