现在分词的完成式主要用在状语中，表示这个动作在谓语所表示的动作之前完成。

　　【例如】

　　Having succeeded in the last examination, she was more confident of another success in the coming one.

　　Having found the cause, they were able to propose a remedy.

　　Having finished his homework, the boy went to play computer game.Notshavingsmade adequate preparations, they thought it better to postpone¹ the excursion till next week.

　　独立结构中也可以用现在分词的完成形式。

　　【例如】

　　His parentsshavingsdied, the orphan² is now taken care of by the government.

　　The guestsshavingsleft, they resumed their discussion.