running is her favorite sport 为什么用running,skating is her favorite sport

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running is her favorite sport 为什么用running,skating is her favorite sport
running is her favorite sport 为什么用running,skating is her favorite sport

running is her favorite sport 为什么用running,skating is her favorite sport
因为run是一个动词,不能作主语,所以用他的动名词形式也就是动词的-ing形式作主语