It's not a good idea to change this file unless you know what you are doing.
这句话中to change 引导的句子是作为主语,但是是否也可以理解成是做定语来修饰idea呢?两种都说得通的吧?
你的理解不错,完全有这种可能性。如果不定式作了idea的定语,那么It 就是代词了,就可以用This, That 取代It。不过,根据你提供的语境,不定式仍然看作是真正主语。
我举一个不定式作idea定语的例子:
It is the only idea to solve the problem. 那是解决此问题的唯一办法。
如果把不定式看作真正主语,it是形式主语,句子就讲不通了。
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It is +名词+to do sth 中TO DO STH 所做成分判断方法如下:
(1)It is +名词+to do sth=This/That is +n.+to do sth(to do 作后置定语用法)
It is the only way to solve the problem.
=This is the only way to solve the problem.
(2)It is +名词+.to do sth=To do sth is +名词(不定式作主语用法)
It is the duty of the police to protect us.
=To protect us is the duty of the police.
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