表示发生在谓语动作之前的动作：

He seems to have caught a cold. 他似乎感冒了。

I hate to have quarreled with her. 我后悔和她吵架了。

I believe it to have been a mistake. 我相信这是一个错误。

You appear to have travelled quite a lot. 你似乎作过多次旅行。

I’m sorry to have given you so much trouble. 对不起给了你这么多麻烦。

It’s said to have been built in the Ming dynasty. 据说它是明朝修建的。

(2) 表示在某个给定的时间之前已完成的动作：

I hope to have finished the work by now. 我希望现在以前已完成这项工作。

(3) 表示过去未曾实现的想法和愿望：

I should like to have come earlier. 我本想早点来的。

We were to have been married last year. 我们本来打算去年结婚的。