be +形容词为什么要再加of 有没有一些例句

it is +adj of sb to sth 此结构中,形容词多是【修饰sb】,表明【人所具有的品质、特点】。常用的形容词有nice,kind,fine,honest,true,good,friendly,enthusiastic,warm-hearted,/bad,cruel,cold-blooded等。例如：It's kind of you to say so。可以转换为：You are kind to say so。It's nice of you to help me。=It's polite of you to do so。区别：It is +adj for sb to do sth 这个结构中,形容词多是【修饰sth】,表示【不定式短语内容所体现出的特点】。常用形容词有：important,unimportant,difficult,hard,easy,necessary,unnecessary ,helpful,useful等。例如：It's important for us to learn a foreign language 。可以转换为To learn a foreign language is important for us。