SAT语法备考中如何抓住句子主干是大家的主要练习内容，因为如果能够抓住句子的主干，大家就可以掌握整个句子的意思，进而更快的挑出答案。
在SAT语法所列的句子中，除了句子主干之外的一切成分都属于句子的干扰项，如定语从句、同位语从句、分词短语作修饰语大的借此短语作修饰语，等等，这些都是我们阅读是需要跳过去的部分。
有时候一个句子中这些成分多达几个，更是阅读时的障碍，应该毫不犹豫地跳过去，先提炼出句子的主干。
这种能力是SAT语法备考中大家应该形成的，也是大家解答关于SAT语法题目的基础。在SAT语法备考中，大家需要抓住主干就需要排除下面几点：人名、地名年代、专有名词、无空格的插入语、定语从句。
例1、Crazy Love， by Elias Miguel Munoz， is an novel： it takes the form of a series of letters.
(A) archetypal (B) epistolary (C) inauspicious (D) inconspicuous (E) illusory
解：排除Crazy Love， by Elias Miguel Munoz，的干扰直接替换成It，选择与a series of letters 对应的epistolary
例2、Rosita Peru， who rose to become the highest ranking female in the television industry， was
recruited： Spanish language program producers courted her persistently.
(A) indiscriminately (B) enigmatically (C) vicariously (D) rancorously (E) assiduously
解：排除干扰 人名 无空格的定语从句用A B替换 人名 题目则可以改写成
A was recruited： B courted her persistently。一目了然：persistently对应assiduously
例3、Although hostile demonstrations and marred James Meredith’s 1962 enrollment at the University of Mississippi， the commencement ceremony in which he became the university’s first African American graduate was surprisingly .
(A) discord.. tranquil (B) pomp.. daunting (C) banality.. conventional
(D) turmoil.. controversial (E) serenity.. opportune
解：排除干扰成分 人名 地名 年代以及定语从句，可以把句子改写成：Although hostile demonstrations and marred A’s enrollment， the commencement ceremony was surprisingly .
第一个空与demonstrations 取同义，选discord 第二个空与mar取反义，选tranquil
例4、The stage director insisted that before the next performance the set be to eliminate its dinginess.
(A) requisitioned (B) enlarged (C) refurbished (D) demolished (E) relocated
解：找出句子的主干 句子可以改写为 The set is to eliminate its dinginess.
to eliminate its dinginess.很快就可以把C refurbish 选出来
例5、Ballads often praise popular figures who have performed feats that many perceive as;such as defending the poor or resisting authority.
(A) modest.. acceptable (B) inescapable. .legitimate (C) insufficient.. overpowering (D) admirable.. unjust (E) unbelievable.. tolerable
解：找出空格所在的那句话的主干 排除干扰成分句子提炼为：Many perceive them as; such as defending the poor or resisting authority. 第一个空和defending the poor 对应，马上选出D admirable
例6、Conceptually， it’s hard to reconcile a defense attorney’s to ensure that false testimony is not knowingly put forward with the attorney’s mandate to mount the most defense conceivable foe the client.
(A) efforts cautious (B) duty powerful (C) inability eloquence (D) failure diversify (E) promise informed
解：只要分清主干 reconcile a defense attorney’s (duty) with the attorney’s mandate 即可知道空格应该填mandate 的反义词：duty 选B
从上面的几个例子中，大家就可以看到找到句子的主干在SAT语法备考中的关键性作用。大家在备考SAT语法试题的时候，自己可以从找句子的主干练习起来。开始的时候，这个过程可能有一点困难，但是经过一段时间的练习，大家就会熟悉掌握了。
