as everyone knows,no one can deny that这句话有语法错误吗

题目

as everyone knows,no one can deny that这句话有语法错误吗
我觉得know不应该加s呀?不是第三人称单数才加s么?everyone不是单数啊

答案

还可以用as it is known to all.
everyone是单数,意思是“每一个人”