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高中英语语法问题,独立主格结构

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高中英语语法问题,独立主格结构
The exam to be held tomorrow,I couldn't go to the movie tonight.
请问这个句子怎么理解.独立主格结构一般不是“doing,having done,done,having been done,形容词等”.这里为什么用不定式?(《张道真》的语法书上是否有例子?这个属于什么现象.),谢谢!

请说明这个语法现象,另外找出可靠的依据,谢谢!
The exam to be held tomorrow,是动词不定式的独立主格结构
表示 一次性动作 将要发生
这与分词的独立主格结构 用法 和意思 不一样
不定式“独立主格结构”
在“逻辑主语+动词不定式”结构中,动词不定式和它前面的名词或代词存在着逻辑上的主谓关系.这种结构也可用一个从句或并列分句来表达.
1.动词不定式用主动的形式
在独立主格结构中,动词不定式和它前面的名词或代词存在着逻辑上的主谓关系.
His mother to come tonight,he is busy preparing the dinner.他母亲今晚要来,他正在忙着准备饭菜.(= As his mother is to come tonight,he is busy preparing the dinner.)
——will you go to the comcert tonight 你今晚去听音乐会吗?
——sorry.So many exerise-books to check,I rially can't afford any time.对不起,有这多的作业要批,我真的抽不出时间.(=Because I shall check so many exercise-books tonight,I really can't afford any time.)
The four of us agreed on a division of labour,each to translate a quarter of the book.我们四人同意分工干,每人翻译全书的四分之一.(=The four of us agreed on a division of labour and each is to translate a quarter of the book.)
Many trees,flowers,and grass to be planted,our newly-built school will look even more beautiful.种上许多的树,花和草后,我们新建的学校将看上去更美.(=If many trees,flowers,and grass are planted,our newly-built school will look even more beautiful.)