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在以某些形容词作表语时，句子的真正主语是一个动词不定式，我们常用代词it作句子的形式主语，而将其真正的主语动词不定式移到表语形容词后面。这时，不定式前常用介词引出不定式的逻辑主语。例如：
1．It is wise for him to get away.他走开是明智的。
2．It is wise of,him to get away.他很明智，他走开了。
不少同学不知如何选择of和for，对这两个介词所引导的逻辑主语在意义上有何差异感到很难理解。本文想就这～问题作一点探讨，仅供参考。
一、分清两类不同的形容词
第一类：easy，hard，difficult，import-ant，necessary，possible，impossible等。这类形容词只反映不定式动词的行为性质，不反映行为者的特征。
第二类：kind，good，nice，brave，cour-ageous，wise，clever，foolish，unvclse，crud，polite，impolite，right，wrong，careful，careless，crazy，selfish，stupid，silly等。这类形容词既可以反映不定式动词的行为性质，也可以反映行为者的特征。它们通常是表示“真假、善恶、美丑”的内涵，被用来评价、鉴定他人的道德、品性或行为规范。 在“It is(was)...”句型中，第一类形容词只能与for搭配；而第二类形容词既可与of搭配，又可与for搭配，不过含义有所不同。例如：
1．It was important for him to speak atthe meeting.
句中for不可换成of。for短语说明不定式表示的动作是谁做的，形容词着重说明行为的特征。意为：It was important that heshould speak at the meeting.不可说成：Hewas important to speak at the meeting.
2．It is kind of you to help us．
句中of可以换成for，不过含义不同。用of时说明不定式指的是谁的情况，即某人怎么样，形容词着重说明行为者的特征。其意思相当于：You are kind to help us．而用for时其含义侧重为：It is kind that you shouldhelp us．
二、分清泛指和特指
如果不定式前的逻辑主语是泛指不是特指，介词就该用for，因为，泛指的行为者不是形容词着重要说明的对象。例如：
1．It is not polite for a person to speakwith his mouth full of food.
2．I don’t think it's right for people tomarry only for money.
3．It's necessary for man to protect na-ture.
注意：在邏辑主语是泛指的情况下，for可以和两类形容词搭配，如上例。
如果不定式前的逻辑主语是特指的、明确限定的，这时就可根据说话者的侧重点来选择of或for。比较例句：
1．It was clever for Edison to inventthe electric light.
2．It was clever of Edison to invent theelectric light．
1句用for短语，侧重指动作的性质，指“爱迪生发明电灯”一事是聪明的行为。而爱迪生本人聪明与否不是说明的主要对象。2句则主要指爱迪生是聪明的，侧重于对他的赞扬，因为他发明了电灯。
注意：在这种情况下，仍要遵循两类形容词与of和for的搭配习惯。如上例2句中clever不可换成第一类形容词，不可说成：Itwas important of Edison to Invent the dec-tric light.
又如：
正：It is wrong for my son to take sucha small house.
正：It is wrong of my son to take such asmall house.
误：It is difficult of my son to take sucha small house.
正：It is difficult for my son to takesuch a small house.
再引用几个词典和教材中的例句：
1．It was not right for the South tobreak away from the Union.
2．It was silly for you to conceal it.
3．It was silly of him to take offence atwhat she had said.
4．You think it's right for people tomarry for money.
5．It's considered impolite for a man towear a hat indoors.
6．Do you think it's normal for a childto get so tired?
1．It is wise for him to get away.他走开是明智的。
2．It is wise of,him to get away.他很明智，他走开了。
不少同学不知如何选择of和for，对这两个介词所引导的逻辑主语在意义上有何差异感到很难理解。本文想就这～问题作一点探讨，仅供参考。
一、分清两类不同的形容词
第一类：easy，hard，difficult，import-ant，necessary，possible，impossible等。这类形容词只反映不定式动词的行为性质，不反映行为者的特征。
第二类：kind，good，nice，brave，cour-ageous，wise，clever，foolish，unvclse，crud，polite，impolite，right，wrong，careful，careless，crazy，selfish，stupid，silly等。这类形容词既可以反映不定式动词的行为性质，也可以反映行为者的特征。它们通常是表示“真假、善恶、美丑”的内涵，被用来评价、鉴定他人的道德、品性或行为规范。 在“It is(was)...”句型中，第一类形容词只能与for搭配；而第二类形容词既可与of搭配，又可与for搭配，不过含义有所不同。例如：
1．It was important for him to speak atthe meeting.
句中for不可换成of。for短语说明不定式表示的动作是谁做的，形容词着重说明行为的特征。意为：It was important that heshould speak at the meeting.不可说成：Hewas important to speak at the meeting.
2．It is kind of you to help us．
句中of可以换成for，不过含义不同。用of时说明不定式指的是谁的情况，即某人怎么样，形容词着重说明行为者的特征。其意思相当于：You are kind to help us．而用for时其含义侧重为：It is kind that you shouldhelp us．
二、分清泛指和特指
如果不定式前的逻辑主语是泛指不是特指，介词就该用for，因为，泛指的行为者不是形容词着重要说明的对象。例如：
1．It is not polite for a person to speakwith his mouth full of food.
2．I don’t think it's right for people tomarry only for money.
3．It's necessary for man to protect na-ture.
注意：在邏辑主语是泛指的情况下，for可以和两类形容词搭配，如上例。
如果不定式前的逻辑主语是特指的、明确限定的，这时就可根据说话者的侧重点来选择of或for。比较例句：
1．It was clever for Edison to inventthe electric light.
2．It was clever of Edison to invent theelectric light．
1句用for短语，侧重指动作的性质，指“爱迪生发明电灯”一事是聪明的行为。而爱迪生本人聪明与否不是说明的主要对象。2句则主要指爱迪生是聪明的，侧重于对他的赞扬，因为他发明了电灯。
注意：在这种情况下，仍要遵循两类形容词与of和for的搭配习惯。如上例2句中clever不可换成第一类形容词，不可说成：Itwas important of Edison to Invent the dec-tric light.
又如：
正：It is wrong for my son to take sucha small house.
正：It is wrong of my son to take such asmall house.
误：It is difficult of my son to take sucha small house.
正：It is difficult for my son to takesuch a small house.
再引用几个词典和教材中的例句：
1．It was not right for the South tobreak away from the Union.
2．It was silly for you to conceal it.
3．It was silly of him to take offence atwhat she had said.
4．You think it's right for people tomarry for money.
5．It's considered impolite for a man towear a hat indoors.
6．Do you think it's normal for a childto get so tired?