SC迷思：「邏輯主詞」（Logical Subject）等於「主詞」嗎？
很多高分區的考點，其實OG都有出現過，只是你不知道如何判斷。其中一個，就是大家天天掛在嘴邊，耳熟能詳的「邏輯主詞」（Logical Subject）。
「邏輯主詞」一提到這個名詞，大家都會覺得「阿不就是主詞嗎？」但仔細想想，如果Logical Subject真的等於Subject，那幹嘛還要特別強調「邏輯」？所以邏輯主詞跟文法上的主詞不一定相同。之所以叫「邏輯」主詞，因為他表達的是「句意上」該找誰當這個動作的主詞。
什麼時候需要找邏輯主詞呢？
句子核心S+V中的V需要找嗎？不用。他的主詞已經在句子中固定了。所以真正需要找主詞的，其實是「修飾語」。
哪些修飾語需要找邏輯主詞？
形容詞子句（which/that…）需要嗎？不需要。因為which跟that已有明確的指代對象。
真正需要的是動作化成的修飾語，也就是分詞結構跟不定詞結構：
1. Ving/Vpp…
2. to V
怎麼找？
邏輯主詞的「邏輯」指的是「句意」，所以一定不能逃避看句意。牢記一個原則：
Among lower-paid workers, union members are less likely than nonunion members to be enrolled in lower-end insurance plans imposing stricter limits on medical services and requiring doctors to see more patients, and spend less time with each.
正確選項(D) that impose stricter limits on medical services and require doctors to see more patients, spending
這裡的, spending less time with each在句意上是see more patients的後果，所以修飾對象是 see這個動作，要跟see共用動作發出者doctor，而不是去找前面的文法lower-end insurance plans主詞。
實際練習：
Australian embryologists have found evidence that suggests that the elephant is descended from an aquatic animal, and its trunk originally evolving as a kind of snorkel.
(B) that has suggested the elephant descended from an aquatic animal, its trunk originally evolving
(E) to suggest that the elephant is descended from an aquatic animal and that its trunk originally evolved
再來一題：
Researchers are using computer images to help surgeons plan difficult operations and to develop programs that will work for doctors and nurses in the same way that flight simulators do for pilots, letting medical personnel practice their techniques and test their reflexes before they ever see a patient.
(A) plan difficult operations and to develop programs that will work for doctors and nurses in the same way that flight simulators do
(B) plan difficult operations and develop programs to work for doctors and nurses the same way as with flight simulators
(C) to plan difficult operations and to develop programs that will work for doctors and nurses like flight simulators
最後是這一題：
New items developed for automobiles in the 1997 model year included a safer air bag , which, unlike previous air bags, eliminated the possibility that a burst of smoke would appear when the bag inflated, and making an already terrified passenger think the car was on fire.
(D) Inflated and make
(E) Inflated to make
About Dustin
最不專業的GMAT教學分享平台。
最討厭商學院卻考了GMAT。
為GMAT考生打造的輔助學習網站。
（那個，拜託，不要叫我老師或顧問。）