10. 当用连词连接两个独立从句时，在连词前加逗号。连词包括"and," "but," "or," "nor," 和 "yet"。 (来源：http://www.EnglishCN.com)

　　When joining two independent clauses with a conjunction, place a comma before the conjunction. Conjunctions include the words "and," "but," "or," "nor," and "yet."

　　Incorrect: The customer ate every piece of the apple pie and the waitress brought another pie.

　　Correct: The customer ate every piece of the apple pie, and the waitress brought another pie.

　　In the incorrect example, the reader may at first think the customer ate the pie and the waitress. In the correct example, the comma before the conjunction tells the reader, "Stop, another independent clause with its own subject (the waitress) is about to begin."

　　11. 通常，在which前面加逗号，但不要在that前面加逗号。虽然有的作者习惯于用which来引入限制性从句，传统用法是用that来引入限制性从句，用which来引入非限制性从句。在引入限制性从句时，在that前不要加逗号，在引入非限制性从句时，在which前一定要加逗号。

　　Generally, use a comma before "which" but not before "that." Although some writers use "which" to introduce a restrictive clause, the traditional practice is to use "that" to introduce a restrictive clause and "which" to introduce a nonrestrictive clause. When writing a restrictive clause, do not place a comma before "that." When writing a nonrestrictive clause, do place a comma before "which."

　　Correct Restrictive Use:

　　The store honored the complaints that were less than 60 days old.

　　Correct Nonrestrictive Use:

　　The store honored the complaints, which were less than 60 days old.

　　These sentences have different meanings as well as different punctuation. In the restrictive sentence, the store honored only those complaints less than 60 days old, but not those over 60 days old. In the nonrestrictive sentence, the store honored all the complaints, all of which were less than 60 days old.

　　12. 在引号内加入逗号，不要在引号外面加，不论逗号是否是其所引用的引语的组成部分。一般的规则是，逗号，句号总是放在引号内，而其他标点，如问号，冒号，分号和感叹号都应该放在引号外面，除非他们原来就是所引用的引语的组成部分。

　　Place commas inside, not outside, quotation marks. Follow this practice whether or not the comma is part of the original quotation. The general rule is that commas and periods should be inside the quotation marks at all times, while all other forms of punctuation, such as question marks, colons, semicolons, and exclamation points, should be outside the quotation marks, unless they were contained in the original quotation.

　　Incorrect: The court held that "physical injury is not a required element of a sexual harassment claim", and the plaintiff went on to win her case.

　　Correct: The court held that "physical injury is not a required element of a sexual harassment claim," and the plaintiff went on to win her case.

　　13. 用两个逗号来分隔日期和地点。表述详细日期（年月日）时，或详细的地理位置（如国家，州，城市）时，在最后的项目前后加两个逗号。

　　Use two commas when setting off dates and places. When using a full date (month, date, year) or multi-part geographical designation (such as city and state or city and country), use two commas around the last part of the designation.

　　Incorrect: On June 28, 1974 Judge Hayes took her seat on the Supreme Court.

　　Correct: On June 28, 1974, Judge Hayes took her seat on the Supreme Court.

　　However: In June 1974 Judge Hayes took her seat on the Supreme Court.

　　Incorrect: Laredo, Texas was host for the 1994 World Rodeo Championship.

　　Correct: Laredo, Texas, was host for the 1994 World Rodeo Championship.

　　Incorrect: We arrived in Tokyo, Japan for the meeting of the G-7 leaders.

　　Correct: We arrived in Tokyo, Japan, for the meeting of the G-7 leaders.

　　参考：从属从句和短语；限制性从句和非限制性从句

　　Cross References: Dependent Clauses and Phrases; Clauses —— Restrictive and Nonrestrictive

　　Compound Adjectives

　　九、复合形容词

　　1. A compound adjective is formed when two or more adjectives work together to modify the same noun. These terms should be hyphenated to avoid confusion or ambiguity.

　　复合形容词由两个或两个以上的形容词组成用以修饰一个名词。组成复合形容词的每个形容词之间要用连字符连接以避免混淆和词不达意。

　　Incorrect: The black and blue mark suggested that he had been involved in an altercation.

　　Correct: The black-and-blue mark suggested that he had been involved in an altercation.

　　Incorrect: Her fifteen minute presentation proved decisive to the outcome of the case.

　　Correct: Her fifteen-minute presentation proved decisive to the outcome of the case.