Help : "( answer the guestions in a using must or can't, give a reason from b. example: 1) they can't be greek. they're speaking italian. a 1) is he il? 2)is the heating on? 3)are they asleep? 4)is she happy? 5)is he a doctor? b it's very cold in here. he's too young. she's just passed her driving test. their bedroom lights are off. he's got a high temperature.