问题描述：
为什么ing形式一般疑问句不能用do
比如She is swimming at the pool改为一般疑问句是Is she swimming at the pool?为什么不是Does she swimming at the pool?想不通,请讲解,谢谢!
比如She is swimming at the pool改为一般疑问句是Is she swimming at the pool?为什么不是Does she swimming at the pool?想不通,请讲解,谢谢!
问题解答：
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