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

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