A comma splice is the use of a comma, instead of a coordinating conjunction or a semicolon, between the two independent clauses of a compound sentence. If the comma is left out, a second grammatical ...
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Beware of run-on sentences!

One of the enemies of effective communication is the run-on sentence. Like ambiguity and dangling modifiers, it hampers understanding and makes speech and writing ugly. You should, therefore, beware ...