不定式，如as to watch, to throw, 和to see是动词最基本的形式。不定式能做名词、形容词和副词。那么不定式和完成时在一起考察是怎样出题的呢，所以本文就给大家介绍下GMAT语法不定式加完成时考点讲解。
GMAT语法大百科每日语法点：不定式加完成时的用法说明
第一个用法，也就是在GMAT中常出现的，信息提供的人不是直接的陈述者
如human beings are thought to have first entered the Americans
human beings first entered这个观点不是这篇文章的作者这么想，而是 are thought(被认为 – 被人们认为)
因为to have 是用在indirect speech，所以经常跟在think, claim, believe 等于陈述信息相关的单词后面多以被动的形式出现. To 前面动词的事态没有限制
第二种用法是future
如he is to have become the next president by the end of January
- he will have become the next 与这个意思想象，不过 will 是uncertain is to have 是certain
he was to have been next president (在过去的时点上看未来)
GMAT不定式加完成时用法实例讲解
Balzac drank more than fifty cups of coffee a day and died of caffeine poisoning; furthermore, caffeine did not seem to bother Samuel Johnson, the great writer and lexicographer, who was reported to have drunk twenty-five cups of tea at one sitting.
(A) furthermore, caffeine did not seem to bother
(B) however, caffeine did not seem to bother
(C) however, caffeine did not seem to have bothered
(D) furthermore, caffeine did not seem to have bothered
(E) in addition, caffeine did not seem to bother
选项分析：
做这个题的时候有些考生可能看到没有划线部分的have drunk 后根据平行原则选C， 但这里因为seem 不是表达别人意见的词，而是做着对这件事情的看法，所以就没有必要用to have bothered
所以 正确 答案是B.
》》点击了解GMAT语法不定式讲解
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