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，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。