按要求改写句子
1. Listen to her, please.(否定句)
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2. Is the girl over there your sister? (肯定句)
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3. He listens to his teacher carefully. (否定句)
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4. Make noise now. (用Tom改写成进行时)
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5. Be here at ten. (否定句)
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6. His group is singing. (一般疑问句)
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