It was impossible for lost time to be made up这句话的结构请问这句话是什么结构主语是什么，是不定式还是lost time？我看的材料说是不定式做主语成分

It was impossible for lost time to be made up这句话的结构请问这句话是什么结构主语是什么，是不定式还是lost time？我看的材料说是不定式做主语成分
It was impossible for lost time to be made up这句话的结构
请问这句话是什么结构
主语是什么，是不定式还是lost time？我看的材料说是不定式做主语成分

It was impossible for lost time to be made up这句话的结构请问这句话是什么结构主语是什么，是不定式还是lost time？我看的材料说是不定式做主语成分
it 做形式主语,to be made up是不定式做后置定语修饰 lost time.
原句可以理解为 making up the lost time was impossible
lost time to be made up整个做主语,强调弥补这个动作

整体结构是主系表，成分如下：
It was impossible for lost time to be made up.
形式主语 系动词 表语 真正主语

不定式的复合结构
It is/was +形容词+for sb/sth to do sth
记住这个句型，是很常用的不错句型哟~！
it是形式主语，真正主语：for sb/sth to do sth
for lost time to be made up 挽回已逝去光阴
It was impossible for lost time to be ma...

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不定式的复合结构
It is/was +形容词+for sb/sth to do sth
记住这个句型，是很常用的不错句型哟~！
it是形式主语，真正主语：for sb/sth to do sth
for lost time to be made up 挽回已逝去光阴
It was impossible for lost time to be made up 挽回已逝去光阴是不可能的。

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it 做形式主语，真正的主语确实是不定式to be made up.
To be made up was impossible for lost time.