It is of sb. to do sth 与 It is for sb. to do sth有何区别 详细具体

5若形容词是描述不定式行为者的性格、品质的，如kind，good，nice，right，wrong，clever，careless，polite，foolish等，用of sb.。 It’s very kind of you to help me. 你能帮我，真好。 It’s clever of you to work out the maths problem. 你真聪明，解出了这道数学题。 若形容词仅仅是描述事物，不是对不定式行为者的品格进行评价，用for sb.，这类形容词有difficult，easy，hard，important，dangerous，（im）possible等。 It’s very dangerous for children to cross the busy street. 对孩子们来说，穿过繁忙的街道很危险。 It’s difficult for us to finish the work. 对我们来说，完成这项工作很困难。 注意 of sb. 的句型通常都可转换为不定式作状语的句子，但for sb. 句型不可以。 It’s very nice of you to offer me a seat. = You are nice to offer me a seat. 十分感谢你给我让座。 It is careless of him to lose so many things. = He is careless to lose so many things. 他丢了这么多东西，真是太粗心了。 It’s very important for you to practise your oral English in daily life. 在日常生活中练习你的英语口语非常重要的。 这句话不能说成：It is very important of you to practise…