4 Complete the sentences with have to / has to or don't/ doesn't have to. 1 Our teacher doesn't like mobile phones. We switch them off during lessons. 2 I know that! work hard for this test! You tell me! 3 My sister is ill. She 4 Your room is terrible! You tidy it up 5 Mario's English is perfect. He study for the tests. 6 I can hear you very well . You shout! stay in bed