Matching Pairs Modal verbsOnline version Small activity to practice modals for obligation by Adamaris Dominguez 1 Running isn't allowed until your leg is better. 2 Eating too much sugar isn't allowed. 3 Wearing a helmet is essential 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. He has to lose weight. You mustn't eat too much sugar. Everyone must wear a helmet. She has to exercise every day. I don't have to take vitamins.