1. They have to go the park. Do they have to go to the park? They don\'t have to go to the park.2. We are able to verify the dictation. Are we able to verify the dictation? We are not able to verify the dictation.3. He went to the cinema. Did he go to the cinema? He didn\'t go to the cinema.4. She can help you. Can she help you? She can not help you.5. We had to play football. Did we have to play football? We didn\'t have to play football.6. He must do Lu\'s lessons. Must he do Lu\'s lessons? He must not do Lu\'s lessons.7. We can use the computer. Can we use the computer? We can\'t use the computer.