It's for sb.和 It's of sb.的用法

问题描述:

It's for sb.和 It's of sb.的用法
说一下这两个的用法和区别

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, 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.
 
for 与of 的辨别方法:
  用介词后面的代词作主语,用介词前边的形容词作表语,造个句子.如果道理上通顺用of,不通则用for.如:
   You are nice. (通顺,所以应用of).
   He is hard. (人是困难的,不通,因此应用for.)