A comma cannot be used to correct most run-on sentences.
Explanation:
A run-on sentence occurs when two or more independent clauses are connected incorrectly. A commonly encountered type of a run-on sentence is a comma splice, which occurs when independent clauses are connected with just a comma, without the use of a conjunction. That is why most run-on sentence cannot be corrected with just a comma, and why a comma cannot properly connect two independent clauses. To correct a comma splice, you can add a conjunction between the clauses, use a semicolon instead of a comma, or make each independent clause its own sentence.
