mistake指“错误，误解，误会”，多指缺乏正确理解造成行动上或认识上的错误。
fault多指性格上的弱点、行为上的过失，强调过失应负的责任。常用搭配：at fault 有过错；find fault挑毛病，找错。
请大家看下面的例句：
1、I think it's a serious mistake to confuse books with life...
我认为把书本同生活混为一谈是大错特错。
2、One should not plead inexperience in excuse of his mistake.
一个人不应该借口缺乏经验来为其错误辩解。
3、The teacher brought him up for his mistake.
老师因他的错误对其进行训斥。
4、His manners had always made her blind to his faults.
他的彬彬有礼总是使她对他的缺点视而不见。
5、A few borrowers will find themselves in trouble with their repayments through no fault of their own.
一些借款人会发现，他们还款遇到了麻烦，但根本不是由于自身的过失造成的。
6、Finally he owned his fault.
最终他承认了错误。