GMAT语法题，又称句子改错题(sentence correction)，是整个GMAT考试中对考生英语语法能力考查要求最高的题型，也往往是中国学生最为头疼的一类题目。没有扎实的语法基础和一定的逻辑分析能力，想要做好语法题难度极高。怎样做好GMAT语法题?下面小编就通过一些经典真题的实例解析，为大家全面讲解GMAT语法题的解题思路和方法技巧。
实例题目：
The widely accepted big bang theory holds that the universe began in an explosive instant ten to twenty billion years ago and has been expanding ever since.
(A) that the universe began in an explosive instant ten to twenty billion years ago and has been expanding
(B) that the universe had begun in an explosive instant ten to twenty billion years ago and had been expanding
(C) that the beginning of the universe was an explosive instant ten to twenty billion years ago that has expanded
(D) the beginning of the universe to have been an explosive instant ten to twenty billion years ago that is expanding
(E) the universe to have begun in an explosive instant ten to twenty billion years ago and has been expanding
选项分析：
(A)that the universe began in an explosive instant ten to twenty billion years ago and has been expanding
【正确】 “that”引导的从句正确地作为“holds”，表达了“widely accepted big bang theory”的具体内容。
【大意】 被广泛接受的大爆炸理论认为，宇宙在一个爆炸的瞬间中开始，并从此一直在扩张。
(B)that the universe had begun in an explosive instant ten to twenty billion years ago and had been expanding
【错误】 动词时态：本选项“had begun”和“had been expanding”分别使用了过去完成时和过去完成进行时，过去完成时仅当表现“过去的过去”的含义时才可以使用。宇宙的开始和扩张并没有发生在某个过去的时间或动作之前，因此“had”被误用。
(C)that the beginning of the universe was an explosive instant ten to twenty billion years ago that has expanded
【错误1】 句子意思：“beginning of the universe was an explosive instant”大意为“宇宙的开始是一个爆炸的瞬间”，简单地说，“开始是瞬间”，表意逊于(A)。
【错误2】 简洁明了：在GMAT语法题中，表达同一个意思时简洁性从高到低依次为动词、形容词和副词、一般名词、动名词(简称VANing原则：V——verb，A——adj.或adv.，N——noun，ing——动名词)，因此“beginning”逊于(A)的“began”。
(D)the beginning of the universe to have been an explosive instant ten to twenty billion years ago that is expanding
【错误】 句子意思：“The widely accepted big bang theory holds”，大意为“大爆炸理论认为”，后面连接的应该是“big bang theory”的内容。既然是描述一个理论，将这一理论用主谓结构叙述出来表意是最合理的，本选项“holds”连接的是一个名词性结构，其核心词为“beginning”，而“of the universe”和“to have been”仅仅是其修饰语而已，可直译为“已经是一个爆炸瞬间的的宇宙的开始”，用来描述“大爆炸理论”的内容是不恰当的，因此本选项的表意逊于(A)。
(E)the universe to have begun in an explosive instant ten to twenty billion years ago and has been expanding
【错误】 句子意思：类似地，见(D)。
解题思路：
过去完成时的问题是GMAT考试中相对较容易识别的时态问题，(B)不表示过去的过去却使用了过去完成时，应立即排除。
“The widely accepted big bang theory holds”后面应该接一件事，因此用“that”引导的从句表意更加合理，排除(D)和(E)。
根据VANing简洁性原则，(C)简洁性逊于(A)，因此选择(A)。
