按要求改写句子。
1. These are my friends.(改为单数句)
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2. Sam is tall.Amy is taller.(合并成一个句子)
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3. It wasn’t fat then. (同义句)
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4. He was naughty then. (变为一般疑问句)
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5. This is a book about London.(变为一般疑问句)
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6. Beijing is in the north of China .(对划线部分提问)
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7. It is a very naughty bird.(变为一般疑问句)
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8. Are you fat?(作出否定回答)
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9. She is a clever pupil.(改为否定句)
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10. This is my little sister.(改为一般疑问句,并作肯定回答)
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