it's very kind of you to help me与it's very kind for you to help me的区别

问题描述:

it's very kind of you to help me与it's very kind for you to help me的区别

只有前面一句是对的为什么,it's very kind for you to help me也好像是对的后面不对,因为for sb to do sth是做某事对某人来说。。。