having shower uses less water than having a bath.为什么用ing形式

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having shower uses less water than having a bath.为什么用ing形式
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having shower uses less water than having a bath.为什么用ing形式
having shower uses less water than having a bath.为什么用ing形式

having shower uses less water than having a bath.为什么用ing形式
因为一个句子不能同时出现2个及以上的谓语动词,这时就需要分词来帮忙.分词是非谓语动词.这里Have做主语,若用原型就和后面动词use冲突,所以要变形式为having