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Semicolons

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  1. Contents
  2. Punctuation
  3. Use Metaphor to Illustrate

 

2.1 Use a semicolon to join two independent clauses that are closely related in meaning and are not joined by a coordinating conjunction (compare 1.1):

 

A filemode digit of 3 identifies a temporary file; temporary files are deleted automatically after being read.

 

2.2 Use a semicolon to join two independent clauses when the second one begins with or includes a conjunctive adverb (nevertheless, therefore, however, otherwise, as a result, etc.) (compare 1.3):

 

If CMS is waiting, the entry will be processed immediately; otherwise, it will be queued until requested.

 

2.3 To avoid confusion, use semicolons to separate items in a series when one or more of the items includes commas (see also 1.1c):

 

This manual also summarizes the Graduate School's mechanical requirements for theses; discusses the special requirements of students who are submitting computer programs as theses; reviews basic principles of punctuation, mechanics, and style; and refers student s to standard references on punctuation, mechanics, style, and usage.

 

 

Colons

 

3.1 Use a colon to introduce a list, an example, an amplification, or an explanation directly related to something just mentioned (compare 4.1) and 4.4):

 

The user may work from one of three modes when typing data into the file area: edit mode, input mode, or power typing. He eventually found that there was only one way to get the quality he expected from the people who worked for him: treat them with respect.

 

3.2 Use a colon to introduce a formal statement or quotation (usually of more than one line):

 

Writers who care about the quality of their work would do well to heed Samuel Johnson's advice: What is written without effort is in general read without pleasure.

 

 

Dashes

 

If your word-processor doesn't have an em-dash (a dash that is the width of a capital M) in its special character set, use two hyphens (--) to make a dash. Whichever one you use, except in journalism, you should leave no space between or on either side of the dash itself. Dashes are more widely accepted today than they were in the past; however, many writers and editors still consider them to be somewhat less formal marks of punctuation—use them sparingly.

 

4.1 Use a dash to introduce a summarizing word, phrase, or clause, such as an appositive (a noun set beside another noun and identifying or explaining it) (compare 3.1):

 

The strikers included plumbers, electricians, carpenters, truck drivers—all kinds of workers.

 

4.2 Use dashes to mark off a parenthetical element that represents an abrupt break in thought. Dashes give more emphasis to the enclosed element than do either commas or parentheses (compare 5.1):

 

Reagan's sweep of the South—he won every state but Georgia—was the most humiliating defeat for Carter.

 

4.3 To avoid confusion, use dashes to mark off parenthetical elements that contain internal commas:

 

Seven of our first twelve presidents—Washington, Jefferson, Madison, Monroe, Harrison, Tyler, and Taylor—were from Virginia.

 

4.4 Dashes can be used as a less formal alternative to the colon to introduce an example, explanation, or amplification (see 3.1).

 

For more on the use of dashes in journalism, see the entry on dashes in the Guide to Punctuation in the Associated Press Stylebook.

 

 


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