GMAT考试的每一门都有自己的分析和解题技巧，GMAT语法同样如此。下面启德考培老师为大家实例讲解GMAT语法前置后置形容词正确运用技巧，希望可以帮助备考的学生。

　　GMAT语法大百科语法点：前置与后置形容词的用法说明

　　1.如果是作为前置形容词:

　　即形容词位于句首,单独修饰主句的主语.

　　该形容词的作用和分词一样,逻辑主语必须一致,而且可以还原为完整的句子.

　　2.如果是作为后置形容词:

　　既形容词位于修饰对象之后,且两者之间有逗号隔开.

　　该形容词的作用作为定语就近修饰,可以还原为定语从句.

　　但如果定语从句中有情态动词,不可以省略为简单的形容词.

　　而且,后置形容词不可以像现在分词修饰整个句子.

　　在该种情况下,必须在形容词前面加上具体名词.

　　GMAT语法前置与后置形容词用法实例讲解

　　In his research paper, Dr. Frosh, medical director of the Payne Whitney Clinic, distinguishes mood swings, which may be violent without their being grounded in mental disease, from genuine manic-depressive psychosis.

　　(A) mood swings, which may be violent without their being grounded in mental disease, from genuine manic-depressive psychosis

　　(B) mood swings, perhaps violent without being grounded in mental disease, and genuine manic-depressive psychosis

　　(C) between mood swings, which may be violent without being grounded in mental disease, and genuine manic-depressive psychosis

　　(D) between mood swings, perhaps violent without being grounded in mental disease, from genuine manic-depressive psychosis

　　(E) genuine manic-depressive psychosis and mood swings, which may be violent without being grounded in mental disease

　　选项分析：

　　首先，这句话用的是一个固定搭配distinguish between x and y，不能用from

　　另外，定从省略多见于省略(which/that+ is/are/was/were)，有情态动词时似乎不该省略。 而如果理解perhapsviolent without being grounded in mental disease为省略which is,就变成which is perhaps violent without being grounded in mental disease,读的就不顺畅。

　　所以最后答案是C

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