1.不定式的完成式：即to have+过去分词。通常情况下，动词不定式完成式所表示的动作发生在谓语动词所表示的动作之前，它的逻辑主语也是句子的主语或宾语。（睁大眼睛看好了，通常情况下，那自然就有特别情况，也就是所谓考点）。不定式的完成式既可能是表示先于谓语动作已经完成，也可能是先于某个特定时间已经完成。如果是持续动作动词，它表示一个一直持续到现在或过去某时的动作。常见的可接不定式完成体的动词有： happen / see / appear / prove / pretend / seem , etc . 常见的可用于“主语+ be said + to have done / been”相当于主动句“People say + that”结构的句型有：be said / reported / thought / supposed / expected / believed / considered / known 等。如：
Charlis Rabbage is generally considered to have invented the first computer.
Charlis Rabbage通常被认为发明了第一台计算机。（高考真题）
Her husband is said to have given up smoking . 据说她丈夫已经戒烟了。
The girl is reported to have been a League member for five years .
据报道那姑娘入团已经5年了。
He seemed to have lived a happy life .
他似乎一直过得很幸福。
He seems to have been hurt.
他似乎受伤了。
He seems to have overlooked one important fact.
他好像忽略了一个重要的事实。
I seemed to have lost the power of speech.
我好像话都说不出来了。
It’s a mistake to have come here.
来到这里是一个错误。
I expect to have finished by tomorrow evening.
我看明天晚上之前可以完成。
Two women are known to have died.
据悉两名妇女死了。
常见的可接不定式完成体的形容词有 glad / happy / sad / disappointed / satisfied / sorry / surprised 等。如：
I'm sorry to have given you so much trouble . 对不起，给你带来了那么多麻烦。
I'm sorry to keep you waiting for a minute . 对不起，要请你等会儿。(说话时还未等)
I'm sorry to have kept you waiting for a long time . 对不起，让你久等了。(说话时已经等了很久)
I'm happy to have seen you . 见到你很高兴。(分手时说)
I'm happy to see you . 见到你很高兴。(见面时说)
2. 某些特别的动词后接的不定式的完成式可表示未曾实现的打算或想法，也就是说，过去本来打算做某事，但实际上没有做成。如：
You were to have arrived there early that day . 那天你们应该早点到那儿。
I was to have helped him then . but I was too busy . 当时我本想帮他的忙，可我太忙了。
They were to have been married last year. 他们本来去年要结婚的。
I meant to have telephoned, but I forgot. 我本来想打个电话，可是我忘了。
We wished to have put out the fire in thirty minutes . (=We had wished to put…) 我们本打算半小时就把火扑灭的。
The engineers planned to have removed the temple before the dam was completed . (= The engineers had planned to remove the…) 工程师们本决定大坝建成之前把那座寺庙移走的。
I would love to have gone to the party last night but I had to work extra hours to finish a report.(高考真题)
我本打算去参加昨晚的聚会，但我不得不加班完成一份报告。
Susan bit back the words she would like to have said
苏珊话到嘴边又咽了回去。
具有这种用法的词有: be ,be about, hope, wish ,expect , think , suppose , want , plan , agree,mean, try,would like,would love等。