现在分词的完成式

1) 作时间状语
* Having watered the flowers，he began to cut the grass. 他把花浇好后，开始割草。
* After having finished his homework, the boy was allowed to watch TV. 这男孩做完作业后才可以看电视。

2) 作原因状语
* Not having finished his work，he could not leave the office. 由于工作没干完他不能离开办公室。
* Having been written in haste, the book has many mistakes. 这书因写得仓促，所以错误不少。
* Having lived with the girl for 5 years, we all know her very well. 因为与那个女孩一起生活了五年，我们都非常了解她。