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：
Despite its covering the entire planet, Earth has a crust that is not seamless or stationary, rather it is fragmented into mobile semirigid plates.
(A) Despite its covering the entire planet, Earth has a crust that is not seamless or stationary, rather it is
(B) Despite the fact that it covers the entire planet, Earth’s crust is neither seamless nor is it stationary, but is
(C) Despite covering the entire planet, Earth’s crust is neither seamless nor is it stationary, but rather
(D) Although it covers the entire planet, Earth’s crust is neither seamless nor stationary, but rather
(E) Although covering the entire planet, Earth has a crust that is not seamless or stationary, but
选项分析：
(A)Despite its covering the entire planet, Earth has a crust that is not seamless or stationary, rather it is
【错误】 句子结构：“rather it is……”是一个主谓结构，和另一个主谓结构“Earth has a crust that is not seamless or stationary”之间应使用连接词，如“and”、“or”、“but”，而“rather”单独并不能用作连接两个主谓结构。
(B)Despite the fact that it covers the entire planet, Earth's crust is neither seamless nor is it stationary, but is
【错误】 平行结构：“neither X nor X”结构中，X和Y应平行(语法功能一致，逻辑含义对等)，但“seamless”和“is it stationary”是两种不同的结构(一个形容词结构和一个带有形容词的部分倒装的主谓结构)，因此无法平行。
(C)Despite covering the entire planet, Earth's crust is neither seamless nor is it stationary, but rather
【错误】 平行结构：见(B)。
(D)Although it covers the entire planet, Earth's crust is neither seamless nor stationary, but rather
【正确】 作从句主语的“it”平行指代了作主句主语的“Earth's crust”，指代关系明确。正确使用了“neither X nor Y”的平行结构。“but”两端连接的结构是“neither seamless nor stationary”和“fragmented into mobile semirigid plates”，虽然形式不相似，但本质上都是用来形容“Earth's crust”的形容词性内容，功能一致，概念对等。
【大意】 虽然它覆盖了整个星球，地壳既不是无缝的也不是静止的，而是破碎成移动的，半刚性的板块。
(E)Although covering the entire planet, Earth has a crust that is not seamless or stationary, but
【错误】 句子结构： “Although covering the entire planet”属于特殊的从句省略，其本意上向表达“Although the earth’s crust covers the entire planet”，根据语法要求，从句省略后，动词“covering”的逻辑主语必须为主句“Earth has a crust……”的主语，即“Earth”，但其本意上的主语实际上是“earth’s crust”，从句省略不合理。
解题思路：
(A)和(E)句子结构有误，立即排除。
(B)(C)平行结构两边并不平行，立即排除。
因此选择(D)。
