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：
Many of the earliest known images of Hindu deities in India date from the time of the Kushan Empire, fashioned either from the spotted sandstone of Mathura or Gandharan grey schist.
(A) Empire, fashioned either from the spotted sandstone of Mathura or
(B) Empire, fashioned from either the spotted sandstone of Mathura or from
(C) Empire, either fashioned from the spotted sandstone of Mathura or
(D) Empire and either fashioned from the spotted sandstone of Mathura or from
(E) Empire and were fashioned either from the spotted sandstone of Mathura or from
选项分析：
(A)Empire, fashioned either from the spotted sandstone of Mathura or
【错误】 见(E)。
(B)Empire, fashioned from either the spotted sandstone of Mathura or from
【错误】 见(E)。
(C)Empire, either fashioned from the spotted sandstone of Mathura or
【错误】 见(E)。
(D)Empire and either fashioned from the spotted sandstone of Mathura or from
【错误】 见(E)。
(E)Empire and were fashioned either from the spotted sandstone of Mathura or from
【正确】 “either from the spotted sandstone of Mathura or from Gandharan grey schist”正确地使用了“either X or Y”的平行结构。
【大意】 很多已知最早的印度教神像可追溯到Kushan帝国，要么以Mathura的沙岩，要么以Gandharan的片岩制成。
解题思路：
“either X or Y”中的“X”和“Y”必须严格平行(即语法功能一致，逻辑概念对等)。只有(E)的“fashioned either from the spotted sandstone of Mathura or from Gandharan grey schist”中，“fashioned”之后连接评价结构“either X or Y”，其中X是“from the spotted sandstone of Mathura”，Y是“from Gandharan grey schist”，其本质都是介词短语，因此语法功能一致，且逻辑概念对等，因此选择(E)。
