Having good eating habits is very good.为什么用is 不用are?

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Having good eating habits is very good.为什么用is 不用are?

因为主语是动名词如having的时候,看作第三人称单数

因为"Having“是动名词,动名词在句中作主语时,看成第三人称单数形式。

having good eating habits is very important. having good eating habits is very important. 动名词做主语,本句已经有系动词is,eat要用ing 拥有