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