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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________________________________________________________________________1. The old man isn't taking a walk in the park.
2. What are you talking about?
3. Who is playing computer games?
4. Is Lily looking for her pencil? No, she isn't. (答案不唯一)