When you do something better than others,it's good for you to share the method,which would bring others to do the same thing when next time they win out.哦漏！！！不可以改成for的亲It's good for you to do sthIt's good of you to do sth两句话表达的意思不一样。嗯 这个我知道的 我是想用OF亲：我并没有乱改啊，只是发表我的看法啊！语言就是这样的。你能说你的就是真理？就连那些语法专家还不是跟着人家的语言来寻找规律罢了。语言是灵活的，咱中国就是把语言学得太死板了。其实我最不喜欢的就是教给学生语法，因为越教越死。亲，在吗，有时间看看我发的最新的问题吗It's good for sb to do sth 某人做某事是好的。相当于：for sb to do sth is goodIt's good of sb to do sth 某人做某事太好了。相当于：sb is good to do sth嗯嗯