在这两个句型中,it在句中都做形式主语。用“for”表示做“某事(to do sth.)”怎么样(形容词),即句中的形容词用来描述做某事的情况。该句型常常可转换成“to do sth. is...”。如:It is impossibel for me to lift the box.(对我来说把这个盒子举起了是不可能的。),重点强调“我举起这个盒子”这件事情是不可能的。“To lift the box is impossible for me.”
而用“of”时,句中的形容词用来描述某人的品行。如It is very kind of to help me carry the box.(帮我搬这个盒子,你真是太好了。),重点强调“你真是太好了”,即“You are very kind”
前者 for 是对于 的意思,it's good for you to stop smoking.戒烟是为你好。
后者 of 是属性,it's very nice of you to help me.=you're very nice to help me. 谢谢你帮我
能转换成sb is/are +形容词的 就是 It is+形容词+of sb to do sth
for是是对于这件事情,修饰的是to stop smoking is good
of是修饰的人.=you're very nice to help me,总不能说help me is
nice吧
it is easy for you 这"对你"来说很"简单"
it is kind of you to help me "你""帮助我"真是太"好"了
it is easy to cook "煮饭"很"简单"
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