按要求改写句子
1. There are twenty-four rooms in the building.(对划线部分提问)
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2. There are some books on the desk.（改为一般疑问句，并作否定回答）
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3. There are some trees in the garden.(改成单数句)
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4. He can drink the water now.(改为否定句)
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5. I have an idea!(改为he做主语)
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