按要求改写句子。
1. We are new actresses. (变为单数句子)
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2. He lives in Shanghai. (变为一般疑问句)
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3. They can empty the trash. (变为否定句)
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4. I went skiing last Saturday. (就画线部分提问)
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5. Is there a dictionary in the bag? (作出两种回答)
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6. I have a sore throat. (写出同义句)
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7. I like swinging. (用she改写句子)
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