Matching Pairs CAN AND MUSTOnline version REVIEW CAN MUST CAN'T AND MUSTN'T WITH IMAGES by Claire Manners 1 2 3 4 5 6 7 8 Dogs mustn't lick your face. You must give your dog their own space. You can teach dogs to do tricks. Your dog can't eat the cushions. Dogs can help people with mobility. Dogs can't drink alcohol. You must feed your dog twice a day. You mustn't leave a dog alone for more than 3 - 4 hours.