（一）逗号与句子
1.在一个句子里,
A。 同一个主语有两个动词,逗号的使用如下:
S + V1 and V2 (VI 与V2平行) 这里在V2前面不能加逗号而且V2前不加再加S或其代词.
B。同一个主语有三个动词，逗号的使用如下：
S+V1，V2 and V3 (V1,V2,V3平行）
2.逗号在句子间的使用
A。两个句子并列的情况下,逗号使用如下:
句子1, and 句子2.
B。在三个句子并列的情况下，逗号使用如下：
句子1，句子2，and 句子3。
OG135. Intar, the oldest Hispanic theater company in New York, has moved away from the Spanish classics and now it draws on the works both of contemporary Hispanic authors who live abroad and of those in the United States.
(A) now it draws on the works both of contemporary Hispanic authors who live abroad and of
(B) now draws on the works of contemporary Hispanic authors, both those who live abroad and those who live
(C) it draws on the works of contemporary Hispanic authors now, both those living abroad and who live
(D) draws now on the works both of contemporary Hispanic authors living abroad and who are
(E) draws on the works now of both contemporary Hispanic authors living abroad and those
In choices A and C, it intrudes between the halves of the compound verb has moved... and [now] 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. The placement of now is awkward in C, and the construction living abroad... and who is not parallel in C and D. Misplacement of words creates ambiguity in E: for example, the positioning of both immediately before the phrase describing the authors suggests that there are only two contemporary Hispanic authors living abroad. The logical word placement and parallel phrasing of B, the best choice, resolve such confusions.
3. 在1的情况下,如果V2前有插入语的话,应该用逗号隔开,形式如下:
S+V1 and, 插入语,V2
TS-Q38: The normative model of strategic decision-making suggests that executives examine a firm’s external environment and internal conditions, and in using the set of objective criteria they derive from these analyses, can decide on a strategy.
A. conditions, and in using the set of objective criteria they derive from these
analyses, can decide
B. conditions, and they use the set of objective criteria derived from these analyses in deciding
C. conditions and, in using the set of objective criteria derived from these analyses, deciding
D. conditions and, using the set of objective criteria derived from these analyses, decide
E. conditions and, in their use of the set of objective criteria they derive from these
key is D
除了C.D外,其他选项应该像B那样补出主语来.
（二）逗号与形容词
A词，B词
A词 and B词
以上两种形式当A。B词的语义类别相同的时候是等价的，否则不等价。
例子：the official financial help; a concrete and glass factory or a concrete, glass factory
OG37. While some academicians believe that business ethics should be integrated into every business course, others say that students will take ethics seriously only if it would be taught as a separately required course.
(A) only if it would be taught as a separately required course
(B) only if it is taught as a separate, required course
(C) if it is taught only as a course required separately
(D) if it was taught only as a separate and required
course
(E) if it would only be taught as a required course, key is B 暂时总结这么的多，有不足之处请指正，希望NN们多补充哈。谢谢
separately
key is B
暂时总结这么的多，有不足之处请指正，希望NN们多补充哈。谢谢
actually sometimes the misuse of comma is not a deciding mistake
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