- A run-on fuses independent clauses without correct punctuation.
- Comma splices (joining clauses with only a comma) are a common form.
- Fixes: split into sentences, add a conjunction, or use a semicolon.
- Long is not the same as run-on; a long sentence can be correct.
- Reading aloud and watching for breathlessness helps spot them.
Fix run-on sentences by finding where two independent clauses are joined incorrectly — fused with no punctuation, or spliced with just a comma — and repairing each: split into separate sentences, add a coordinating conjunction, or use a semicolon. Note that a long sentence is not automatically a run-on; the issue is grammatical joining, not length. Reading aloud and noticing where you run out of breath or lose the thread surfaces them quickly.
Chapter i·Why it matters
Run-ons and comma splices confuse readers and read as unpolished, undermining otherwise good prose. Because they often come from writing the way we think — clause piling onto clause — they slip in unnoticed. Learning to recognize the independent-clause boundary and apply the right fix cleans up clarity and rhythm. Distinguishing a true run-on from a correctly built long sentence also keeps you from chopping up prose that was fine.
Chapter ii·What to include
- Identification of fused independent clauses.
- A check for comma splices specifically.
- Fixes: split, add a conjunction, or use a semicolon.
- The distinction between long and run-on.
- A read-aloud test for breathlessness.
- Sentence variety preserved, not flattened.
Chapter iii·Example
A writer finds: "She opened the door, the room was empty." Two independent clauses joined by only a comma — a splice. She fixes it three possible ways and chooses a period for punch: "She opened the door. The room was empty." Across the chapter she repairs several splices without turning every sentence short and choppy.
Chapter iv·Related questions
WriteLoom's Edit studio supports a focused line pass, so run-ons and splices get caught without flattening your sentence variety.
See the Edit studio