帮我看看这是什么语法On what basis were the Southern states to be brought back into the Union?•On what basis were the Southern states to be brought back into the Union?这个句子里state厚的to do是怎么回事 然后为什么用

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帮我看看这是什么语法OnwhatbasisweretheSouthernstatestobebroughtbackintotheUnion?•OnwhatbasisweretheSouth

帮我看看这是什么语法On what basis were the Southern states to be brought back into the Union?•On what basis were the Southern states to be brought back into the Union?这个句子里state厚的to do是怎么回事 然后为什么用
帮我看看这是什么语法On what basis were the Southern states to be brought back into the Union?
•On what basis were the Southern states to be brought back into the Union?这个句子里state厚的to do是怎么回事 然后为什么用

帮我看看这是什么语法On what basis were the Southern states to be brought back into the Union?•On what basis were the Southern states to be brought back into the Union?这个句子里state厚的to do是怎么回事 然后为什么用
On what basis were the Southern states to be brought back into the Union?
属于正常的疑问句倒装句式,陈述句语序应为:The Southern states were to be brought back into the Union on the following basis.
be to do 是一种情态用法
(1)表示事先商定、安排或准备要做的事情.如:
The students are to meet at the school gate tomorrow.明天学生们将在学校大门口集会.
2)表示可能性,必要、责任、义务、禁止等.如:
Her necklace was not to (couldn't) be found.她的项链找不到了.

基于什么样的基础,南方诸州被收回联邦? to be 表示结果啊 On what basis 是提前了

to be 是主语补语,补充说明states.

这是特殊疑问句
对介词宾语 提问
to be brought 是动词不定式的被动形式 作表语
were 是系动词 加后面的不定式
可以 看作 过去将来时
也就是 be to do 句型