按要求改写句子。 1. The old man is taking a walk
题型：句型转换
问题：
按要求改写句子。
1. The old man is taking a walk in the park. (改为否定句)
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2. We are talking about how to learn English well. (对画线部分提问)
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3. Mike is playing computer games. (对画线部分提问)
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4. Lily is looking for her pencil. (改为一般疑问句，并作否定回答)
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