If you join two or more main clauses with a coordinating conjunction, you should never use a comma in front of that coordinating conjunction.

Name: If you join two or more main clauses with a coordinating conjunction, you should never use a comma in front of that coordinating conjunction.
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When joining two or more main clauses with a coordinating conjunction (such as "and," "but," "or," "nor," "for," "so," or "yet"), a comma is typically used before the coordinating conjunction to separate the clauses.

If You Join Two or More Main Clauses with a Coordinating