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 can help people with mobility. Dogs can't drink alcohol. Dogs mustn't lick your face. You can teach dogs to do tricks. Your dog can't eat the cushions. You must feed your dog twice a day. You must give your dog their own space. You mustn't leave a dog alone for more than 3 - 4 hours.