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