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Run-On Sentences

Run-on sentences occur when writers try to combine more than one idea into a single sentence. They cause confusion because readers are not sure when one idea ends and the next one begins. Read our entry and test your knowledge with our quiz!


Prepositions are words that describe the placement or purposes of an object; some examples are “around”, “under”, “behind”, “of”, and “for”. They can help you add details to a sentence: “the dresser in the bedroom” is more specific than just “the dresser” because it explains where the dresser is located.


Phrases that start with a preposition are known as prepositional phrases. Remember, the subject of your sentence should never be in a prepositional phrase, because the phrase is just there to add more detail!