【在线等】改错you have made mistake is a fact，要理由

改法：在句首加引导词that
原因：主语从句中的引导词不能省掉

Your having made a mistake is a fact .一个句子需要有主谓宾，而这三着皆应由正确性质的词语，短语或句子充当。

前面加一个that，变成主语从句
因为一个句子里已经有了两个谓语动词了，have made 和is

which is a fact.因为要有一个限定词特指前面的mistake

you have made mistake which is a fact,理由 出现两个谓语 必须找个主语