当形容词说明不定式逻辑主语的性质、特性时,用of。常见的形容词有kind, good, nice, clever, stupid, foolish, considerate, polite, impolite, cruel等。
It is kind of the teachers to help support the poor students.
=The teachers are kind to help support the poor students.
去帮助支持贫困的学生,这种老师真好。
例 (2009·福建)—How amazing it is that astronauts are exploring outer space!
—It's a challenge, I guess, ________man against nature.
A.of
B.for
C.by
D.about
解析:I guess在此是插入语,去掉后的句子为“It's a challenge of man against nature”,由此可以得出答案为of。
答案:A
2.It is+adj.+for sb. to do sth.
当形容词说明不定式的性质时,用for。常见的形容词有important, necessary, possible, impossible等。
It is quite important for us to protect our environment.
对我们来说保护我们的环境相当重要。
四、of+抽象名词=形容词
of+great/much+抽象名词=very+形容词;of+no+抽象名词=not+形容词
It is of great/much value.=It is very valuable.
它很有价值。
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