6th grade run-on sentences worksheets

Sixth grade run-on worksheets read like editing practice for real essays: longer clauses, comma splices, and run-ons buried in detail. Your child repairs each one with a period or a comma and a conjunction, the same two moves editors use.

Free printable PDF worksheet, aligned to Common Core L.4.1.f.

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The kind of sentences you'll fix

Each line runs two sentences together. Add the missing period and capital letter to split them.

The night shift restocked the shelves the store looked new by morning.
Fixed: The night shift restocked the shelves. The store looked new by morning.
The trail narrowed past the ridge loose gravel made every step tricky.
The marathon route climbed two hills most runners slowed near the top.

Every print pulls a fresh set of sentences at this level, so a make-up test or a second sibling never gets the same sheet.

What's on each sheet

Fix it. Each line runs two sentences together. Add the missing period and capital letter to split them. 8 sentences to fix per page.
Choose the sentence. Circle the letter of the correctly punctuated sentence. 8 questions per page.

Every version prints on US Letter or A4, with its answer key on the last page.

How to teach this

Speed and transfer are the goals. After the sheet, have your child scan one paragraph of their own writing for the longest sentence and test it: more than one who-did-what pair with no joining word means a run-on made it through. Finding one in the wild beats ten drills.

Watch for: Kids split at the first breath instead of the end of the idea. Have them find the second who-did-what pair; the split goes right before it. Kids think a comma fixes a run-on. A comma alone makes a comma splice, which is still a run-on wearing a disguise. It needs a period or a comma plus a joining word.

Common questions about run-on sentences

Is this too basic for sixth grade?: Run-ons and comma splices are among the most-marked errors in middle school writing. These items use sixth grade sentence length and vocabulary, so the practice matches what their own drafts look like.
What should mastery look like?: Repairing an item on the first read and naming which repair they used. The follow-up that sticks: finding one run-on in their own writing and fixing it the same way.

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Aligned to Common Core L.4.1.f. Reviewed by the One more sheet team. Content version 178, updated August 2026.

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