Question

i think it iswrong of him not to take our advice

i think it iswrong of him not to take our advice为什么用of不用for

Answer 1

1. It is adj.+ for +sb.+ to do 
   与事物有关的形容词时用 for (e.g.possible,impossible,
   important,necessary,essential,convenient,difficult,hard,
   easy,useless...) 
   例句：It is difficult for him to do so.
   2.It is adj.+ of +sb.+ to do 
   与人的赞美和批评有关的形容词时用of(e.g.nice,kind,wise,
   good,polite,impolite,right,clever,bad,wrong,cruel,
   stupid,foolish...) 
   例句：It is very considerate of you to help me.

2. i think it is wrong of him not to take our advice 

   我认为他不采纳我们的意见是错误的

Answer 2

记住一句话: it is nice of you