Playing football is difficult.为什么用Play+ing ,

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Playing football is difficult.为什么用Play+ing ,
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Playing football is difficult.为什么用Play+ing ,
Playing football is difficult.为什么用Play+ing ,

Playing football is difficult.为什么用Play+ing ,
play是动词,动词是不能做主语的,之有名词或带有名词性的词或句子可以.加上ing就成为了动名词,可以充当句子的主语.

动名词作主语……如果不这样,楼主认为应该怎么说呢?

此处playing属于动名词做主语