60 不定式作主语：It + … + to do sth. Track 060
（1）It + … + to do sth.
不定式作主语，常见的是用it作形式主语，放在句首，将真正的主语——动词不定式（短语）放在句子后面。
a. It is easier to spend money than to make money.
b. It takes time to study English well.
注意：此处形式主语it不能用this或that来替换。
This（A） is impossible for（B） people to stare directly（C） at the sun. 人们不可能直视太阳。
答案：A。This 改为It。
（2）不定式结构也可直接置于句首作主语，此时谓语动词要用单数形式
例句
a. To err is human; to forgive, divine.
犯错人皆难免，宽恕则属超凡。
b. To solve this problem takes a genius like Einstein.
c. To love for the sake of being loved is human, but to love for the sake of loving is angelic.
d. To send a letter is a good way to go somewhere without moving anything but your heart.
不定式作主语，常见的是用it作形式主语，放在句首，将真正的主语——动词不定式（短语）放在句子后面。
a. It is easier to spend money than to make money.
b. It takes time to study English well.
注意：此处形式主语it不能用this或that来替换。
This（A） is impossible for（B） people to stare directly（C） at the sun. 人们不可能直视太阳。
答案：A。This 改为It。
（2）不定式结构也可直接置于句首作主语，此时谓语动词要用单数形式
例句
a. To err is human; to forgive, divine.
犯错人皆难免，宽恕则属超凡。
b. To solve this problem takes a genius like Einstein.
c. To love for the sake of being loved is human, but to love for the sake of loving is angelic.
d. To send a letter is a good way to go somewhere without moving anything but your heart.
