一句话中，如果主语发生改变，整句话的逻辑语义会随之发生变化。即常见错误中的逻辑语义错误。但是这个问题也是很多同学不太容易察觉的，因为一般而言，主语的改变会表现地比较委婉和难以分辨。今天我们就说一下GMAT语法考试中的逻辑主语。
在GMAT逻辑试题中找逻辑主语是做GMAT考试中的语法要注意的第一个需要重视的考点，第一遍先浏览题目，就能发现考点，最关键的是句子的逻辑意思，选项会在句首放置不同的名词或者是代词，把逻辑意思搞懂才能知道谁才应该是句首doing或者done的动作发出者。(若句首的doing或者done是没有划线的，后面划线部分主语必须用一个明确的名词才行。这种情况下，主句主语用代词it或者they必定错，因为指代不明。)当然考试的时候，会将多个考点融合，比如平行结构，单复数等等。
While digging in the Egyptian desert, huge fossil bones have been found by paleontologists, which appears to have been the second most massive dinosaur that ever lived.
A. huge fossil bones have been found by paleontologists, which appears to have been
B. huge fossil bones have been found by paleontologists, which appear to be from
C. it appears that paleontologists have found huge fossil bones that are from
D. paleontologists have found huge fossil bones from what appears to be
E. paleontologists have found huge fossil bones, which are from what appear to be
翻译：当在埃及沙漠挖掘的时候，考古学家发现了生存过的第二大恐龙的骨化石。
句式：While digging...., paleontologists have found huge fossil bones from what appears;
思路：看到digging马上想到他的动作发出者，应该是人。然后后面的appears寻找他的发出者。
选项：
A. 化石骨头不能作为digging的动作发出者
B. 化石骨头不能作为digging的动作发出者
C. It不能作为digging的动作发出者
D. 正确
E. Appear的动作发出者应该是后面的世界第二大恐龙，应该用单数
Imported into Massachusetts form Europe in 1869, the gypsy moth was used by a French scientist in an attempt at developing a strong strain of silk-producing insects, crossing gypsy moths with adult silkworms.
A. Imported into Massachusetts from Europe in 1869, the gypsy moth was used by a French scientist in an attempt at developing a strong strain of silk-producing insects, crossing gypsy moths with adult silkworms.
B. Imported into Massachusetts form Europe in 1869, a French scientist was attempting to develop a strong strain of silk-producing insects by crossing gypsy moths with adult silkworms.
C. To cross gypsy moths with adult silkworms, in attempting the development of a strong strain of silk-producing insects, a French scientist in 1869 imported the gypsy moth into Massachusetts from Europe.
D. The gypsy moth was imported into Massachusetts from Europe in 1869 by a French scientist attempting to develop a strong strain of silk-producing insects by crossing gypsy moths with adult silkworms.
E. In an attempt at the development of a strong strain of silk-producing insects, a French scientist, importing the gypsy moth from Europe into Massachusetts in 1869 in order to cross gypsy moths and adult silkworms.
翻译：1869年从欧洲进口到曼彻斯特，舞毒蛾被一个法国科学家用来培育一种产生丝的昆虫，他通过交配舞毒蛾和成年蚕。
句式：The moth was imported into Massachusetts by....doing....by
思路：逻辑主语的区别，动作发出者的区别。
选项：
A. Attempt to do 企图做某事，用固定词at;crossing修饰the gypsy moth错误;
B. imported修书主语与后面的a French scientist不一致;
C. To cross gypsy moths with adult silkworms, 修饰错误;句子意思，为了CROSS GYPSY和虫子，法国科学家会做什么;句意逻辑错误;
D. 正确;
E. 句子不完整，主句没有谓语。
当选项的差异最后分到了单复数的不同，那么我们就看前面的逻辑主语谁能发出这个动作;这里的动词差异是appear，后面说了第二大的恐龙;前面应该是单数名词;这个单数恐龙是世界第二大的;根据逻辑意思来选定主语，并依此判定单复数。
》》点击了解GMAT语法逻辑主语该如何查找
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