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Two specific situations call for the use of a comma before "and." The first is created when we have three or more items in a series. This mark of punctuation is called the serial comma.

The second situation occurs when "and" is being used to coordinate two independent clauses. An independent clause (also known as a main clause) is a group of words that has a subject and a verb, and can stand alone as a sentence.

Examples:

The man was selling apples and oranges. (no comma)

The man was selling apples, oranges, and bananas. (commas after apples, Oranges)

They went out of town and forgot about the package. (no comma)

They had to go out of town, and the package was never delivered.

The second clause does not share the subject of the first clause (they) and a comma separates the two thoughts.

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13y ago

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