to have done怎么理解,这个是不定式的完成时,可以举例子说明吗?

to have done 是不定式的完成结构 表示这个动作发生在谓语动作之前 所以要用完成结构
He is said to have lost his car.比如这个句子的谓语动词的 is said 但是 lose his car 这一动作发生在谓语动词 said 之前 所以非谓语要用 完成式