按要求改写句子。
1. We went to the store this morning. (改为否定句)
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2. Did you buy a ball at the store? (改为肯定句)
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3. We played basketball. (改为一般疑问句)
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4. We bought a pair of runners. (就划线部分提问)
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【考点】否定句,疑问代词,肯定句,一般疑问句

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