I felt as though I was split in two, so keen was my desire to follow her, and yet so deep was my longing for the woman whose spirit had truly companioned me and upheld my own.

1.书上是这么讲解这个句子的：

So 开头引起部分倒装, 其结构是“主语补语+系动词+其他”，请问老师，到底是“主语补语”还是“表语”？

2. as though引导的从句是非真实情况用作比喻，所以as though I was split in two是使用虚拟语气。正式用法是were，这里用was是非正式用法。

解答如下：

你的问题涉及到以so开头倒装的问题

在”so…that…”和”such…that…”引导的结果状语从句中，当so和such位于句首时，用”so\such + ... +部分谓语+ 主语+...”； 主句倒装, that从句不倒装:

so /such ……that句型可以构成部分倒装句，表示强调so /such和that之间的部分：

A:so+形容词+系动词(be)+主语+that

So angry was he (He so angry) that he couldn’t speak.

他如此愤怒，以致说不出话来。

So selfish was she that everyone avoid talking with her.

=She was so selfish that everyone avoid talking with her.

So difficult was the exam that most of the students failed to pass it.

=The exam was so difficult that most of the students failed to pass it.  

So easy is it that a child can learn it.

=It is so easy that a child can learn it.

So clever is he that he can work out all the difficult problems in the book.(全部倒装)

=He is so clever that he can work out all the difficult problems in the book.

So frightened was the girl that she daren't move an inch further.

=The girl was so frightened that she daren't move an inch further.

So small was the mark that I could hardly see it.

=The mark was small that I could hardly see it.

(备注：在该结构中，“so +形容词”是表语的前置;。）

B:so+副词+助动词(did/do/does)+主语+谓语+that

So hard did he work that he finally won the fame.

So hard does he work that he has made great progress in English.

So loudly did he speak that even people in the next room could hear him.

So quickly did the workmen finish their work that they were given a bonus.

So much does he worry about his financial position that he can’t sleep at night.

He runs so fast that he is far ahead of others.

=So fast does he run that he is far ahead of others.

备注：也存在such+be+主语的情况用以强调

Such was Albert Einstein, a simple man of great achievements.

阿尔伯特爱因斯是一个有伟大成就的普通人

Such was the force of the explosion that all the windows were broken.

爆炸的威力如此之大，以致所有的窗户都被震破了。

I felt as though I was split in two, so keen was my desire to follow her, and yet so deep was my longing for the woman whose spirit had truly companioned me and upheld my own.

1. 书上是这么讲解这个句子的：

So 开头引起部分倒装, 其结构是“主语补语+系动词+其他”，请问老师，到底是“主语补语”还是“表语”？

2. as though引导的从句是非真实情况用作比喻，所以as though I was split in two是使用虚拟语气。正式用法是were，这里用was是非正式用法。

【答】

第一个问题：“主语补语”，也叫“主语补足语”，其实就是我们现在说的“表语”。国内有些人仍然沿用国外语法家的术语，把“表语”叫作“主语补语”。

有些国外语法家认为，句子除了主干部分（“主+谓+宾”）外，其他成分都是辅助成分，次要成分。主、谓、宾都可以有自己的补语，以增加新意或补足其表意的残缺或不完整。因此，就有了以下所谓的补语：

主语补足语： subject complement

谓语补足语： predicate complement

宾语补足语： object complement

从他们给的定义和列举的例子来看：主语补足语，其实就是我们通常说的表语；谓语补足语，就是我们所说的状语；宾语补足语，跟我们现在的叫法基本一致。

第二个问题：I felt as though I was split in two. 像as if，as though 引导的从句，是否用虚拟语气，在很大程度上，取决于说话者的态度和看法。

就这个句子而言，was 跟felt 时态完全一致，所以不是虚拟语气，而是陈述语气。

若改为were 或had been 则是虚拟语气。

【几条重要规则】

对于as if 是否使用虚拟语气，可以这样下个结论：

（1）如果as if 从句所表达的内容可能是事实的时候，使用陈述语气。

（2）as if 从句明确地表示不是事实。在这种情况下，仍然可以使用陈述语气。就是说，当as if 从句可以明显地看出所表达的内容是非真实的时候，使用陈述语气或虚拟语气是没什么区别的。例如：

The toy dog barks as if it is a real one. 这只玩具狗叫起来就像它是一条真狗。（“玩具狗”，无论如何都不是真的，谁都能看得出来。即便用了陈述语气，也知道它是假的！）

He talks as if he has/had a potato in his mouth.（都意味着“他嘴里并没有真地含着一个土豆”。）

（3）如果as if 从句所表达的内容可能是，或可能不是事实的时候，这时，是否用虚拟语气，取决于说话者的态度。

鉴于此，以下表达都正确：

as though I was split in two （陈述语气）

as though I were split in two （虚拟语气）

as though I had been split in two （虚拟语气）

此外，关于倒装结构：so keen was + 主语, and yet so deep was + 主语

so keen 和so deep 是两个并列的表语，有各自的主语。表语和主语颠倒位置，不单是因为so而倒装，而是因为主语相对较长的缘故，为了平衡句子结构、避免头重脚轻而采用的修辞方法。

1. “主语补语”也叫做“表语”。

2. 根据《牛津英语用法指南》第三版74.2节，在as though后面表示“不真实”的从句中，正式文体用 were ，非正式文体用 was 。