獨立結構: 在用分詞短語作狀語時, 它邏輯上的主語一般必須與句子的主語一.致. 但有時它也可以有自己獨立的邏輯上的主語, 這種結構稱為獨立結構, 一般表示一種伴隨的動作或情況. 　　He rushed into the room, his face covered with sweat. 　　有時可以表示時間: 　　Late that autumn, his work finished, he prepared to return to his institute. 　　表示原因: 　　Her eyes dimmed with tears, she did not see him enter. 　　條件: 　　All things considered, her paper is of greater value than yours.