This is “Semicolons”, section 3.2 from the book Successful Writing (v. 1.0).
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Another punctuation mark that you will encounter is the semicolon (;)A punctuation mark that indicates a pause and joins two independent clauses or separates a list when the list already requires commas.. Like most punctuation marks, the semicolon can be used in a variety of ways. The semicolon indicates a break in the flow of a sentence, but functions differently than a period or a comma. When you encounter a semicolon while reading aloud, this represents a good place to pause and take a breath.
Use a semicolon to combine two closely related independent clauses. Relying on a period to separate the related clauses into two shorter sentences could lead to choppy writing. Using a comma would create an awkward run-on sentence.
Correct: Be sure to wear clean, well-pressed clothes to the interview; appearances are important.
Choppy: Be sure to wear clean, well-pressed clothes to the interview. Appearances are important.
Incorrect: Be sure to wear clean, well-pressed clothes to the interview, appearances are important.
In this case, writing the independent clauses as two sentences separated by a period is correct. However, using a semicolon to combine the clauses can make your writing more interesting by creating a variety of sentence lengths and structures while preserving the flow of ideas.
You can also use a semicolon to join items in a list when the items in the list already require commas. Semicolons help the reader distinguish between items in the list.
Correct: The color combinations we can choose from are black, white, and grey; green, brown, and black; or red, green, and brown.
Incorrect: The color combinations we can choose from are black, white, and grey, green, brown, and black, or red, green, and brown.
By using semicolons in this sentence, the reader can easily distinguish between the three sets of colors.
Use semicolons to join two main clauses. Do not use semicolons with coordinating conjunctions such as and, or, and but.
On your own sheet of paper, correct the following sentences by adding semicolons. If the sentence is correct as it is, write OK.