It's + adj. + of sb.+ to do sth. 和 It's + adj. + for sb.+ to do sth.
It's + adj. + of sb.+ to do sth. 和 It's + adj. + for sb.+ to do sth.
sparkle520一般来说，of sb. 前面的形容词是 careful，careless，clever，foolish，polite，impolite，lazy，good，kind，nice，wise... 说明 动词不定式的行为人的性格、品质.
for sb. 前面的形容词是 dangerous，difficult，easy，hard，heavy，important，interesting，necessary... 说明 不定式动作的特性.
例 It's very kind of
you to help me. ( 你能帮助我，真是太好了. )
例 It's foolish of him
to make such mistakes. ( 他真傻啊，竟然犯这种错误. )
例 It's dangerous for
you to swim alone. ( 你自己一个人去游泳很危险. )
例 It's very difficult
for us to climb the mountain. (
对我们来说爬这座山很困难. )
还有一个区别是：在 of sb. 中，可用 sb. 直接作 主语 来改写句子. 而 for sb. 结构是不可以这样转换的.
It's very kind of you to help me. = You are very kind to help me.
