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Are you watching television? No, I'm not.
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Are you playing chess with your sister? No, I'm not.
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Are you listening to music? No, I'm not.
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Are you jumping on the trampoline? No, I'm not.
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What are you doing? I'm doing my homework.
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Are you building sandcastles with your brother? No, I'm not.
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Are you surfing the net? No, I'm not.
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What are you doing? I'm busy