(1) 表示发生在谓语动作之前的动作。如：
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’m sorry to have given you so much trouble. 对不起给了你这么多麻烦。
(2) 表示在某个给定的时间之前已完成的动作。如：
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。如：
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。
，英语语法：不定式完成式的三点用法说明
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