独立主格结构指带主语的动词分词、介词、或副词词组。 何谓独立主格结构?
它是指与主语之间无任何语法关系的`名词或代词加上一个分词的结构。它不修饰单个的词，而修饰整个句子。独立主格结构可位于句子的任何部位。它构成一个单独实体，并具有如下两种功能： 解释原因或情景 提供主句中重点部分的相关细节。
例 Freud distinguished three kinds of anxiety, each arising from a different source of perceived danger.
each 是独立主格结构，arising from是动词短语。注意这个独立主格结构是一个干巴巴的句子。通过改变动词形式，它的面貌可焕然一新：Each arises from a different source of perceived danger.
再看以下例句
Before: His nose was running and his hands were shaking. He left the theater like that.
Interesting: His nose running and his hands shaking, he left the theater.
Before: He is known for his bad temper, so I fear the encounter.
Interesting: I fear the encounter, his temper being what it is.
Plain: If the weather is favorable tomorrow, we will spend the entire day climbing Huang Shan.
Good: Weather permitting, we will spend the entire day tomorrow climbing Huang Shan.
