薄冰“英语语法”P507 并列句由两个或两个以上的简单句并列而成。常见的结构是： 简单句＋对立连词＋简单句。这种简单句常被叫做分句。等立连词之前可用逗号，也可不用逗号。如： They were happy and they deserved their happiness. The signal was given, and the steamer moved slowly.
Rule 11. If something or someone is sufficiently identified, the description following it is considered nonessential and should be surrounded by commas.
Example Freddy, who has a limp, was in an auto accident. Freddy is named so the description is not essential.
The boy who has a limp was in an auto accident. We would not know which boy is being referred to otherwise; therefore, no commas are used.
Rule 12. Using a comma is optional to separate two sentences joined by a coordinating conjunction—and, or, but, for, nor.
Example I have painted the entire house, but he is still working on sanding the doors. OR I have painted the entire house but he is still working on sanding the doors.
Rule 13. Use the comma to separate two sentences if it will help avoid confusion.
Example I chose the colors red and green, and blue was his first choice.
Rule 14. If the subject does not appear in front of the second verb, do not use a comma.
Example He thought quickly and still did not answer correctly. The subject does not appear after the and, so no comma is used.
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发表于 2004-1-4 19:40:00
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