非谓语动词的用法

He is said to have come here.
He is thought to have done it.
He is believed to have done it.
He seemed to have known it. 在wish, hope, expect, intend, mean, suppose等动词过去时后，说明行为动词没有实现。 We wished to have done this.
I expected to have left by then.
(=I had expected to heave by then.) 　

完成式动名词

说明动名词表示的动作，此句中动词表示的动作先发生。 We regret having told you the news.
After having finished his work, he went home. 
He denied having broke the glasses.

完成式分词

说明分词表示的动作，此句中谓语动词表示的动作先发生。多数表示一些瞬时间动词。如果是hear; see或表示位置转移的动词arrive; leave; turn; open.不用完成时 Having finished his work, he went home.