1.It's necessary ___for___us to master a language.
2.It's unwise ___of___them to refuse our help.
3.It is very important ___for__us to study some rules.
4.It is unpracticable ___for___us to finish such a difficult task
in such short time.
5.It's wrong __of / for___a person to think only of himself. （这一句for / of 都可以，看你站在什么立场上，出题人不太严谨）
窍门：
如果被认为是普遍现象，就用for,如：
1.It's necessary ___for___us / people to master a language.
2 It is very important ___for__us / learners to study some rules.
3 .It is unpracticable ___for___us / anyone to finish such a difficult task in two days.
如果被认为是某个人的个别现象，我们就用of,如：
1 It was wrong of me / John / us / the girl to be late again ans again.
2 It is very kind of him to give us so much help. (也就是说，he肯，但别人不一定肯)
你确定这里有可以用of的吗？ 我觉得都用for比较合适 呵呵
1. for （for在此表示“对......来说”）
2. for （理由同上）
3. for （同上）
4. for （同上）
前四个题里都含有一个相同的句型：It's + adj.+ ( for sb. ) + to do sth. “对某人来说做某事是......的。”
5. for
for与of的区别：
介词for可以用来表示“原因”或“目的”；of则表示所属关系，是“名词所有格”这个语法项目里的一部分，翻译出来是“......的”，但翻译的时候要从of后往of前翻译。例如翻译“Maria是我的朋友之一”： Maria ia a friend of mine.
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