讲义
句型

It is ＋ 形容词＋ of (描写人) ＋ 人 ＋ to V

It is ＋ 形容词＋ for (描写事)＋ 人 ＋ to V

描写人的形容词常用的有：

kind cruel smart clever wise

foolish stupid thoughtful considerate polite

rude selfish careless generous stingy

描写事的形容词常用的有：

important necessary possible impossible natural

dangerous easy hard difficult convenient

It's selfish of you to eat up the whole cake.

你真自私把整个蛋糕都吃完了。

It's kind of you to help me. 你真好心帮我的忙。

It's impolite of you to say so. = You are impolite to say so.

你这么说话太没礼貌了。

It's good for you to swim regularly. = To swim regularly is good for you. 定时的游泳对你有好处。

It is natural for dogs to swim. 狗会游泳是很自然的事。

你人真好来帮我的忙。

It's stupid of you to believe every word he says.

他说的每句话你都相信，真是愚蠢。