不定式是英语语法的一个重要的版块，今天，小编为同学们准备了相关的不定式语法体系下的不定式的完成体的使用规则，一起来看看吧！
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1) 如果不定式动作是瞬间动作动词，它表示一个在现在或过去某时之前已经完成的动作；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。
a . 常见的可接不定式完成体的动词有：? happen / see / appear / prove / pretend / seem , etc .
He seemed to have lived a happy life .
他似乎一直过得很幸福。(他的幸福生活一直持续到现在)
b . 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：
Her husband is said to have given up smoking . 据说她丈夫已经戒烟了。(“戒烟”发生在“据说”之前)
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。(不定式表示谓语动作前所处的状态)
c . 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。
比较下面不定式的一般时和完成时的区别：
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)
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)
2) be + 不定式完成时态表示该做或想做但未做的动作。如：
You were to have arrived?? there early that day . 那天你们应该早点到那儿。(但你们晚到了)
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。(未帮他的忙)
3) 表示“意图，打算”之意的动词如 hope , wish , expect , think , suppose , want , plan , agree , mean , try 等用过去时，又后接不定式完成式作宾语时，表示想做而未做的事情。这种意义也可用这类词的“过去完成时+不定式的一般式”表达。如：
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。(结果没有)
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。(结果没有)
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