A semicolon should be used to separate two constructions of generally equal weight. Remember, a semicolon is stronger than a comma, but weaker than a period. Generally, a semicolon is used to separate two independent clauses without a conjunction or with a conjunctive adverb.
- Proofreading requires alertness; a tired mind will miss many errors.
- She completed her report on time; however, she neglected to proofread it.
A semicolon should be used to separate items in a series when one or more of the items contain commas.
- Seminars were conducted in Dallas, Texas, on July 18, 2000; in Washington, DC, on October 21, 2000; and in St. Louis, Missouri, on May 13, 2001.
A semicolon should be used to separate two independent clauses joined by a coordinating conjunction when at least one of the clauses contains commas that could result in a misreading of the sentence. This is an exception to the rule that the comma, not the semicolon, is used with coordinating conjunctions joining independent clauses. The coordinating conjunctions include for, and, nor, but, or, yet, and so.
- We ordered legal paper, toner cartridges, and black ballpoint pens; but manila folders, envelopes, and binder clips were sent instead.
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