to be kind/friendly/nice to sb 对某人很好是固定搭配 而be kind of sb 是评价一个人很善良如：It is kind of you to help her get though the difficulty; It is impossible for him to get the top. 品德用of,其他的用fo
of ,be kind of 意思是对别人好能再详细些吗？额，错了，是be kind to sb，我记混淆了，当评价某个人怎么样时，用of ，如it is+形容词+of的形式，如it is nice of you to do sth，it is polite of you to do sth。其他就用for，如，it is difficult for him to complete the tas...
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