Sentence fragments and run-ons — Language, 11–13
A sentence needs a complete thought and a clear stopping point. You learn to spot pieces that cannot stand alone and sentences that have been joined without a proper break.
A sentence needs a whole thought
A sentence should give the reader a complete thought, not just a loose piece. “Because the dog barked” leaves us waiting; “The dog barked because it heard a noise” can stand on its own. A run-on goes the other way: it pushes complete thoughts together without a clear break.
Why stopping points matter
Readers build meaning one sentence at a time. If a sentence stops before the thought is finished, they must guess what is missing; if several thoughts run together, they may not know where one ends and the next begins. Checking sentence boundaries makes writing easier to follow, not merely more correct.
Repairing one sentence
Start with: “Mia opened the window the room was too warm.” First, find two complete thoughts: Mia opened the window; the room was too warm. Then choose a repair: “Mia opened the window because the room was too warm.” The joining word shows the relationship and the sentence now has one clear shape.
A long sentence is not always wrong
It is tempting to call every long sentence a run-on, because long sentences can feel tiring. But length is not the test: a sentence may contain several ideas if punctuation or joining words show how they fit. The real problem is a missing boundary, not a large number of words.
Useful when you revise
Use this check in messages, homework and instructions. Read each sentence and ask: “Could this stand as a complete thought?” Then look for two complete thoughts joined only by a space or a comma. Fixing those spots helps a reader follow your meaning without stopping to untangle it.
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