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：
Emily Dickinson’s letters to Susan Huntington Dickinson were written over a period beginning a few years before Susan’s marriage to Emily’s brother and ending shortly before Emily’s death in 1886, outnumbering her letters to anyone else.
(A) Dickinson were written over a period beginning a few years before Susan’s marriage to Emily’s brother and ending shortly before Emily’s death in 1886, outnumbering
(B) Dickinson were written over a period that begins a few years before Susan’s marriage to Emily’s brother and ended shortly before Emily’s death in 1886, outnumber
(C) Dickinson, written over a period beginning a few years before Susan’s marriage to Emily’s brother and that ends shortly before Emily’s death in 1886 and outnumbering
(D) Dickinson, which were written over a period beginning a few years before Susan’s marriage to Emily’s brother, ending shortly before Emily’s death in 1886, and outnumbering
(E) Dickinson, which were written over a period beginning a few years before Susan’s marriage to Emily’s brother and ending shortly before Emily’s death in 1886, outnumber
选项分析：
(A)Dickinson were written over a period beginning a few years before Susan's marriage to Emily's brother and ending shortly before Emily's death in 1886, outnumbering
【错误1】 修饰成分：非谓语动词“outnumbering”在本选项中作状语(动词的修饰语)，其逻辑主语为“Emily Dickinson's letters”，与所修饰动词“were written”的主语相同，这意味着“outnumbering”是动词“were written”的伴随状语，根据与法要求，“doing”应伴随所修饰动词同时发生且同(逻辑)主语。有日常逻辑可知，本题中“outnumbering”(“数量超过”)不应伴随“信件背写”之一动作同时发生，因此修饰关系不合理。
【错误2】 句子意思：由日常逻辑可知，本句的句意重心更应该是“outnumbering”(“数量超过”)，如(E)，而非“were written”，因此“outnumbering”作修饰语表意逊于(E)。
(B)Dickinson were written over a period that begins a few years before Susan's marriage to Emily's brother and ended shortly before Emily's death in 1886, outnumber
【错误】 句子结构：“were written”和“outnumber”均为“Emily Dickinson's letters”的谓语动词，而两只之间不存在任何连接词，如“and”、“or”或“but”等，主谓结构组合方式有误。
(C)Dickinson, written over a period beginning a few years before Susan's marriage to Emily's brother and that ends shortly before Emily's death in 1886 and outnumbering
【错误】 句子结构：“written”和“outnumbering”均无法成为“Emily Dickinson's letters”的谓语动词，于是“Emily Dickinson's letters”失去谓语，主谓结构不完整。
(D)Dickinson, which were written over a period beginning a few years before Susan's marriage to Emily's brother, ending shortly before Emily's death in 1886, and outnumbering
【错误1】 句子结构：“were written”是“which”引导的定语从句中的谓语动词，而主句中“Emily Dickinson's letters” 失去谓语，主谓结构不完整。
【错误2】 平行结构：“and outnumbering”无法和任何结构搭配形成平行结构。
(E)Dickinson, which were written over a period beginning a few years before Susan's marriage to Emily's brother and ending shortly before Emily's death in 1886, outnumber
【正确】 “beginning”和“ending”正确地平行在了一起，“outnumber” 是“Emily Dickinson's letters”的谓语动词，两者构成了主句的主谓结构。
【大意】 Emily Dickinson给Susan Huntington Dickinson的信被写于从Susan嫁给Emily的弟弟后不久到Emily去世前不久，数量上超过了她写给其他任何人的信。
解题思路：
(B)、(C)和(D)句子结构有问题，立即排除。
(A)和(E)对比发现“outnumbering”作伴随修饰不合理。
因此选择(E)。
