It is more difficult to solve a problem than that of finding a question.详细句子结构分析that of finding a question 为什么不能是thant to find a question?

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It is more difficult to solve a problem than that of finding a question.详细句子结构分析that of finding a question 为什么不能是thant to find a question?

It is more difficult to solve a problem than that of finding a question.详细句子结构分析that of finding a question 为什么不能是thant to find a question?
It is more difficult to solve a problem than that of finding a question.详细句子结构分析
that of finding a question
为什么不能是thant to find a question?

It is more difficult to solve a problem than that of finding a question.详细句子结构分析that of finding a question 为什么不能是thant to find a question?
句意:比起找出一个问题来,解决一个难题更难.
分析:
句型:It's + 形容词 + to do .意为做某事如何.
it 是形式主语,形容词做表语,不定式to do是真正的主语.
后面的than…question这个短语做状语.
that是表示比较的对象,of finding a question说明that的内容.

It主语(形式主语)
is 谓语动词(系动词)
more difficult 表语
to solve a problem 主语(真正地主语)
than that of finding a question状语
整个句子是主系表结构