语法是英语的基础，语法保证了语言的完整性和逻辑性。因而，SAT语法你需要关心的主要是几个基本原则：1、句子基本完整性(必须是完整句)；2、一致性(语意与结构)；3、意思本身的精确性(学会把意思读准读出来)；4、依据上面的标准扔错的剩对的。

用几个例子来说明：

1 Unlike the other major planets, Pluto hasa highly eccentric orbit, which is thuscloser to the Sun than Neptune is for 20years out of every 230

year cycle, eventhough it is commonlydescribed as the remotest planet in the solar system.

(A) Pluto has a highly eccentric orbit,which is thus closer to the Sun than Neptune is

(B) Pluto has a highly eccentric orbit andis thus closer to the Sun than Neptune is

(C) Pluto's orbit is highly eccentric andis thus closer to the Sun than Neptune

(D) the orbit of Pluto is highly eccentricand thus closer to the Sun than Neptune

(E) the orbit of Pluto is highly eccentric,thus closer to the Sun than Neptune is

解答：句子开头的“不像其他行星”是个一致性标志，意味着主句主语必须是行星的平行词。据此浏览选项主语，干掉CDE,留下AB。再对比AB,发现内部都有比较，这也是一致性标志，那再看谁更烂，扔掉。A说P有个什么样的轨道，轨道更接近太阳，比N.意思是轨道和N比，已经不一致，干掉。B 没法不对了，否则就没有答案了。要不再看一眼。B说：P有什么样的轨道因此P更接近太阳比N.两行星比，对了。答案还是B.

2. Unlike most severance packages, whichrequire workers to stay until the lastday scheduled to collect, workers at theautomobile company are eligible for itsseverance package even if they find anew job before they are terminated.

(A) the last day scheduled to collect,workers at the automobile company are eligible for itsseverance package

(B) the last day they are scheduled tocollect, workers are eligible for the automobilecompany's severance package

(C) their last scheduled day to collect,the automobile company offers its severancepackage to workers

(D) their last scheduled day in order tocollect, the automobile company's severancepackage is available to workers

(E) the last day that they are scheduled tocollect, the automobile company's severancepackage is available to workers

句开头的“不像大多数分手费”说明句子主语也该是分手费的类似概念，据此浏览划线内主句主语，干掉ABC,留下DE.DE的区别很小，那就认真读意思：D说，带到最后一天以便拿那笔钱;E说，最后一天是他们准备要收的：拜托，E讲他们不是拿钱，而是拿最后一天!区别出来了没有?选D。

3. Having finally reached a tentative laboragreement with its company's pilots, itmust now be determined by the airline'sboard of directors how the airline can bothincrease profits and compete moreeffectively for customers than they did in the past.

(A) it must now be determined by theairline's board of directors how the airline can bothincrease profits andcompete more effectively for customers than they did in the past

(B) it must now be determined by theairline's board of directors how the airline can bothincrease profits and mustcompete more effectively than in the past for customers

(C) the airline's board of directors mustnow determine both how to make the airlineincrease profits and compete moreeffectively for customers than they did in the past

(D) the airline's board of directors mustnow determine how the airline can both increaseprofits and compete moreeffectively for customers than it did in the past

(E) the airline's board of directors mustnow determine how the airline can both increaseprofits and also how to make itcompete more effectively than in the past for customers

解答：用HAVING 开头，按照一致性原则，主句主语应该是动作发出者：据此干掉前两个。后三个都有BOTH... AND...一致性标志那看谁更一致：C说BOTH HOW....AND COMPETE，错;D没看出错，Ebothincrease ....and also how, 错。选D.

注意：实际考试时句子(含划线部分)可能很长，因此将选项逐一读完很费时间，因此建议大家关注一致性的落脚点，据此用长项竖读的方式，快速干掉违反一致性原则的选项。

以上就是SAT语法的重要原则，大家在复习备考的时候万万注意。