按要求改写句子。
1. There is a picture. (改为复数句)
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2. There's a bed in the room. (改为否定句)
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3. My English teacher is pretty. (改为一般疑问句)
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4. A book is on the desk. (用there be句型改写)
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5. I'd like some beef and cabbage for dinner. (就画线部分提问)
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