GMAT对语法改错的考查早已超过语言知识本身，具有很强的综合性和很大的迷惑性。而其又具有自身固定的原则，由于考查范围广、出错点多、原则多样化。如何把死原则来灵活处理运用是我们提高的关键，下面通过几个例子深入体会一下。
　　1. Dr. Hakuta's research among Hispanic children in theUnited Statesindicates that the more the children use both Spanish and English，their intellectual advantage is greater in skills underlying reading ability and nonverbal logic.
　　(A)their intellectual advantage is greater in skills underlying reading ability and nonverbal logic
　　(B)their intellectual advantage is the greater in skills underlaying reading ability and nonverbal logic
　　(C)the greater their intellectual advantage in skills underlying reading ability and nonverbal logic
　　(D)in skills that underlay reading ability and nonver­bal logic, their intellectual advantage is the greater
　　(E) in skills underlying reading ability and nonverbal logic, the greater intellectual advantage is theirs
　　 菜鸟语法手册上给出了比较长的解释，如下：The best choice is C. The phrasethe more the childrenshould be completed by a parallel phrase that begins with a compara­tive adjective and a noun phrase, as inthe greater their... advantage.Only C correctly completes the structure with a parallel phrase. Choices A. B, D, and E present structures that are unwieldy and awkward in addition to being nonparallel, and that state the relationship between language use and skills development less clearly than C does. Also,underlayingin B andunderlayin D are incorrect; the meaning of this sentence requires the present participle of "underlie,"underlying,as a modifier ofskills.
　　其实本题不需要分析那么多，只要知道the more…the…的结构形式就能直接确定，因为这是一个主要因素。
　　2.Unlike the acid smoke of cigarettes, pipe tobacco, cured by age-old methods, yields an alkaline smoketoo irritating to be drawn into the lungs.
　　(A) Unlike the acid smoke of cigarettes, pipe tobacco, cured by age-old methods, yields an alkaline smoke
　　(B) Unlike the acid smoke of cigarettes, pipe tobacco is cured by age-old methods, yielding an alkaline smoke
　　(C)Unlike cigarette tobacco, which yields an acid smoke, pipe tobacco, cured by age-old methods, yields an alkaline smoke
　　(D) Differing from cigarettes' acid smoke, pipe tobacco's alkaline smoke, cured by age-old methods, is
　　(E) The alkaline smoke of pipe tobacco differs from cigarettes' acid smoke in that it is cured by age-old methods and is 
　　解答本题时首先排除的是D答案，因为differ from不能用在句首。本题的正确答案为C，但是很多考生的目光都是在C上暂作停留就转向其他选项了。原因是C中连用了两个yield，这样的句子毫无美感可言，缺乏变化。可是千万别忘记考虑到句子重心问题，其他几个答案都是把句子重心搞错了，smoke和cigarette对应有误，这可是大禁忌，比起这个错误来，用词重复还算得了什么呢？

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