1. 名词(代词)+现在分词
There being no bus, we had to walk home.
2. 名词(代词)+过去分词
The workers worked still harder, their living conditions greatly improved.
由于工人们的生活条件大大提高，他们工作得更起劲了。
He was listening attentively in class, his eyes fixed on the blackboard.
他上课专心听讲，眼睛紧盯着黑板。
