Why isn't your sister coming? - She isn't at home., Your dad says he is hungry. - No, he couldn't be. He ate the whole just thirty minutes ago., She says she is sick. - No, she can't be. She hasn't been going out for a week., You are making so much noise. Your dad is sleeping. - No, he can't be sleeping. I saw him going to the kitchen., I always get bad grades in math. - You must not study hard enough., Why is Monica eating only salad? She hasn't touched anything else. - I have no idea. She might not want to eat., I want to talk with your manager. - Wait please, I need to phone first. He may not be in his room., Where is your father? - I don't know. He might be watering the plants outside., I can't find my notebook. - You must have left it in the school., Pete said he had an accident yesterday and said he was badly injured. - He must have been driving fast at the time of the accident then.,

Match the statements with correct negative form.

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