按要求改写句子。
1. You look sad. (变为否定句)
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2. Ann is a beautiful girl. (变为一般疑问句)
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3. My father feels happy. (就画线部分提问)
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4. I have a picture-book. (变为一般疑问句)
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5. I get up at 6: 00. (就画线部分提问)
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