GMAT语法的知识点可能还会考察一些比较细节的知识点，比如连词，标点和量词。这几个小知识点也是大部分考生容易忽略的。其实连词可以帮助我们分析句子的逻辑结构。本文就给大家介绍一下GMAT语法连词and yet前加逗号的用法说明。
1. and连接parts of sentences前面不一定add逗号
Theoretically, this
convection would carry the continental plates along as though they were on a conveyor
belt and would provide the forces needed to produce the split
that occurs along the ridge.
(1)and 连接两个句子，主语一致省略，但前面并没有用逗号隔开!
The enclosed seas are an important feature of the earth’s surface,
and seriously require explanation because, in addition to the
enclosed seas that are developing at present behind island arcs, there are a
number of older ones of possibly similar origin, such as the Gulf of Mexico,
the Black Sea, and perhaps the North Sea.
(2)and 连接两个句子，主语一致省略，但前面用逗号隔开了!
2.两个分别有独立主谓结构的并列句子中间用and连接, and前必须有逗号
》》点击了解GMAT句子改错之连词，标点和量词考点解析
GMAT高频连词and yet前加逗号用法实例讲解1
Bankers require that the financial information presented to them by mortgage applicants be complete and follow a prescribed format.
(A) be complete and follow a prescribed format
(B) is complete and it follows a prescribed format
(C) be complete and a prescribed format is followed
(D) to be complete and a prescribed format be following
(E) be completed, and it followed a prescribed format
In choices A and C, it intrudes between the halves of the compound verb has moved... and draws to introduce a new grammatical subject, thereby creating a run-on sentence:the inclusion of it requires a comma after classics to set off the new independent clause (以此类推，and 连接并列句，如果第二句中出现主语的话，则and前一定要有逗号隔开).
所以答案是A。
推荐练习：
Galileo was convinced that natural phenomena, as manifestations of the laws of physics, would appear the same to someone on the deck of a ship moving smoothly and uniformly through the water as a person standing on land.
(A) water as a
(B) water as to a
(C) water; just as it would to a
(D) water, as it would to the
(E) water; just as to the
(A)water as a
【错误】 比较结构：本选项属于比较句式。不同于一般的比较结构，比较句式的本质是两个平行可比的主谓结构在进行比较，这不过其中一个主谓结构发生了省略。大体上，本句的两个相互比较的主谓结构可以还原为“natural phenomena appear the same to someone on the deck as natural phenomena appear to a person standing on land”。本选项将后半句话。
省略后只剩下“a person standing on land”阴影部分被完全省略。这种写法产生了比较歧义，因为我们无法确定“a person”在第二个主谓结构中所作成分，它或与“phenomena”平行，或与“someone”平行，而如果像(B)那样改写为“to a person……”做可以明确显示出其与前一个主谓结构中的“to someone”平行。
(B)water as to a
【正确】 “to a person standing on land”明确地与“to someone on the deck”平行，将这个比较句式省略的部分补全为：natural phenomena would appear the same to someone on the deck of a ship moving smoothly and uniformly through the water as they (natural phenomena) appear to a person standing on land.
【大意】 伽利略确信，自然现象，根据物理规律，对于匀速运动的船甲板上的人和对于站在岸上的人来说，看起来是一样的。
(C)water; just as it would to a
【错误1】 代词指代：GMAT语法中，代词应指代与其数量形式一致的名词性结构，本选项“it”本意上应指代“phenomena”，但“phenomena”实际上是“phenomenon”的复数形式(尤其在题干中的复数谓语动词“appear”也可以判断出这一点)，因此指代关系无法建立。
【错误2】 句子结构：“;”用来连接语法功能一致的结构。“;”如果用做连接两个主谓结构，则两个主谓结构语法结构上应当平行，“just as +S(主语)+V(谓语)”本质上是“just as”引导的比较从句，而“;”之前出现的句子是主句，主、从句之间语法功能不一致。
(D)water, as it would to the
【错误】 代词指代：见(C)中【错误1】
(E)water; just as to the
【错误】 句子结构：“;”用来连接语法功能一致的结构，而本选项“;”两边不存在语法功能一致的结构。
【最优解题思路推荐】
“it”无法指代复数的“phenomena”，立即排除(C)、(D)。
(E)中“;”连接的结构语法功能不一致，应排除。
比较(A)、(B)，添加“to”后比较关系更加准确，因此选择(B)。
以上就是小编为大家整理的关于GMAT语法连词and yet前加逗号的用法说明的内容介绍，小伙伴们知道了吗? 希望对考生有帮助，更多关于GMAT备考的资讯小编会持续为大家送上，大家也可以关注GMAT官网获取更多备考资讯，祝大家早日梦圆名校。
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