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.

6th grade run-on sentences

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.

Each print is a different sheet with its own answer key. You don't need to sign up.

The kind of sentences you'll fix

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

The mural took the whole semester the unveiling drew a real crowd.
Fixed: The mural took the whole semester. The unveiling drew a real crowd.
The ferry rocked in the swells several passengers gripped the rail.
The bread refused to rise the yeast had expired in March.

Every print pulls a new set of sentences at this level, so a make-up test or a second sibling gets a different mix.

What's on a 6th grade sheet

6th grade sheets draw from 48 sentences, 8 to a page. 5th and 6th grade print from the same 48 sentences. The teaching notes below are written for this grade.

A few of the sentences, as the answer key corrects them:

The yearbook sold out by noon. The office ordered a second printing.
The reunion photo took forever. Somebody always blinked.
The librarian repaired the atlas spine. The maps inside were older than the school.

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: two parts that could each stand alone, joined by nothing or by a comma alone, mean a run-on made it through. A part that starts with because, when, or although doesn't count; it leans on the other. 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 two parts that could each stand alone as a sentence; the split goes where the second one starts. A part that opens with when, because, or if can't stand alone, so it stays attached to the sentence after 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 6th grade 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.

Related worksheets

Ready to print one?

Need a fresh set of sentences? Download another copy.

Aligned to Common Core L.4.1.f. Reviewed by the One more sheet team. Content version 241, updated October 2026.

Spot a mistake on this sheet? Tell us. · About these worksheets