句型“It is+adj.+(for sb)to do sth."和“It is+adj.+(of sb)to do sth."两个句型中，for sb和of sb怎么区别，在使用时要注意adj是说明sb的品质特点的还是说明to do sth的就可以了.说明sb的品质特点用of sb;说明to do sth用for sb.，
简单一句话说就是：说人的用of sb. 说事的用for sb。
1）for sb. 常用于表示事物的特征特点，表示客观形式的形容词，如easy, hard, difficult, interesting, importang,
impossible等：
It's very hard for him to study two languages. 对他来说学两门外语是很难的。
2）of sb的句型一般用表示人物的性格，品德，表示主观感情或态度的形容词，如good, kind, nice, clever, foolish, right。
It's very nice of you to help me. 你来帮助我，你真是太好了。
例:
It is difficult for him to finish the task within two hours.
(difficult 说明完成任务难)
It is kind of you to help me.(kind说明你善良)
另外be kind to sb=be good /friendly to sb意思是"对人好"，例如：
They are kind to each other. 他们彼此间很友好。
be kind to do sth. 好心做某事
She was kind enough to write this letter for me.
承蒙她的好意，替我写这封信。
完成下列句子,试试:
1. It was stupid ____ me to talk in that way to my mother.
2. It is very important ___ us to master English.
3. It was impossible ____the little boy to carry such a heavy box.
4. It is smart ___ them to make good use of the Internet.
参考答案:1.of 2.for 3.for 4.of
。