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