独立主格结构非谓语动词作状语时，它的逻辑主语应该是句子的主语
但有时非谓语动词带有自己的主语，从而在结构上与主语不发生关系，我们称之为独立主格结构（Absolute Construction）
其实，所谓“独立主格结构”也并非真正独立，它还是一种从属的结构
非谓语动词独立主格结构 在独立主格结构中，非谓语动词和它前面的名词或代词存在着逻辑上的主谓关系
Such an able man to help you，you will surely succeed sooner or later
有这么能干的人来帮你, 你迟早一定会成功的
（such an able man 和 to help you 之间存在着主谓关系） = Since such an able man will help you, you will surely succeed sooner or later
He seating himself at the desk, his mother began to tell him a story
他在书桌旁坐好后，他母亲开始给他讲故事
（seating himself at the desk 拥有了自己的逻辑主语 he，注意是“主格”） = When he seated himself at the desk, his mother began to tell him a story
The key to the bike lost, he had to walk to school
由于丢了自行车钥匙，他只好步行去学校
（lost 的逻辑主语是 the key，lost 也可以用完成式having been lost） = Because the key to the bike had been lost, he had to walk to sch
