一、请仔细观察下列句子中独立结构的作用
1. 名词（代词）+ 现在分词
The clock striking twelve, I went to bed. （表原因）
2. 名词（代词）+ 过去分词
He lay there on his back, his teeth set, his right hand clenched on his breast. （表伴随）
3. 名词（代词）+ 形容词短语
Her face pale with anger, she rose to go away. （表原因）
4. 名词（代词）+ 介词短语
Then, last night, I followed him here and climbed in, sword in hand. （表方式）
5. 名词（代词）+ 副词短语
Summer over, the students returned to school. （表原因）
