Run-on sentences are independent clauses that have not been joined correctly. An independent clause is a word group that does or could stand alone as a sentence. When two or more independent clauses appear in one sentence, they must be joined in one of these ways:

• with a comma and a cordinating conjuction (and, but, or, nor, for, so, yet).
• with a semicolon (or occasionally a colon or a dash).

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