当"what matters "做主语时,谓语动词应用单数吗?为什么?

问题描述:

当"what matters "做主语时,谓语动词应用单数吗?为什么?

谓语用单数的道理其实很简单,因为 matters 本身就是动词单三形式
What matters?
It matters.
What matters is what you promise.
同义句:"It is " what you promise that matters.