按要求改写句子。
1. Would you like to play ping-pong? (肯定句)
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2. We can buy some runners. (否定句)
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3. I don't have a ball either. (肯定句)
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4. I think so. (否定句)
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5. I have a basketball. (将主语换为she)
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6. These are shorts. (就划线部分提问)
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