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English Grammar and Writing

Run-Ons, Comma Splices, and Fragments

Spot Them, Fix Them, Stop Losing Points: A High School & College Primer

Every English teacher has a red pen, and three mistakes keep drawing it out: run-on sentences, comma splices, and fragments. If those marks show up on your essays, this guide is for you.

**TLDR: Run-Ons, Comma Splices, and Fragments** is a focused, no-fluff primer that walks you through the three most common sentence-boundary errors in student writing — what they are, why they happen, and exactly how to fix them. You will learn to identify an independent clause (the real unit of a sentence), recognize the patterns that produce fragments and run-ons, and apply five reliable repair strategies that work in any essay or exam context. A dedicated section shows how professional writers bend these rules deliberately, so you can tell the difference between a purposeful stylistic choice and a mistake. The guide closes with a practical proofreading checklist you can use under time pressure.

This book is written for high school students in grades 9–12 and early college writers who need to stop losing points on grammar — fast. It is also useful for tutors prepping a session and parents helping a kid untangle a confusing concept their teacher flagged. At roughly 15 pages, it covers exactly what you need and nothing you don't.

If fixing comma splice grammar errors has been on your to-do list, this is the shortest path to getting it done. Pick it up and finish it before your next draft is due.

What you'll learn
  • Identify an independent clause and distinguish it from a dependent clause or phrase.
  • Recognize fragments, run-on (fused) sentences, and comma splices in your own and others' writing.
  • Apply five standard fixes: period, semicolon, comma + coordinating conjunction, subordination, and rewriting.
  • Understand when fragments and stylistic comma splices are acceptable in skilled writing.
  • Edit a draft confidently for sentence-boundary errors before turning it in.
What's inside
  1. 1. The Independent Clause: The Building Block You Need First
    Defines independent and dependent clauses and phrases so the reader can tell where a sentence legitimately begins and ends.
  2. 2. Fragments: Sentences That Aren't Quite Sentences
    Explains what makes a fragment, the three most common fragment types students write, and how to repair each.
  3. 3. Run-Ons and Comma Splices: Two Sentences Crashing Into One
    Distinguishes fused sentences from comma splices and shows why both count as the same underlying mistake.
  4. 4. The Five Fixes: A Toolkit for Joining (or Separating) Clauses
    Walks through period, semicolon, comma + FANBOYS, subordination, and full rewrite, with worked examples for each.
  5. 5. When the 'Rules' Bend: Stylistic Fragments and Splices in Real Writing
    Shows where skilled authors break these rules deliberately and how to tell the difference between an effect and an error.
  6. 6. Editing Your Own Draft: A Practical Checklist
    A repeatable proofreading routine for catching sentence-boundary errors under time pressure on essays and exams.
Published by Solid State Press
Run-Ons, Comma Splices, and Fragments cover
TLDR STUDY GUIDES

Run-Ons, Comma Splices, and Fragments

Spot Them, Fix Them, Stop Losing Points: A High School & College Primer
Solid State Press

Run-Ons, Comma Splices, and Fragments

Spot Them, Fix Them, Stop Losing Points: A High School & College Primer

Copyright © 2026 Solid State Press.

Published by Solid State Press.

All rights reserved. No part of this book may be reproduced or transmitted in any form without prior written permission, except for brief quotations in critical reviews and educational use.

Part of the TLDR Study Guides series.

Who This Book Is For

If you're a high school student who keeps losing points on essays for "awkward sentences" or "grammar errors in essay writing," this book was written for you. It's equally useful for English grammar help for college freshmen facing their first composition course, and for any parent trying to help a kid with grammar homework who needs a clear, no-nonsense reference.

This primer covers the three sentence boundary errors that appear most often in student writing: fragments, run-ons, and comma splices. You'll learn how to fix run-on sentences, how to recognize a comma splice, and how to avoid run-ons on essay exams and timed writing assessments. Think of it as a sentence fragments practice book and a comma splice grammar worksheet combined into one focused study guide — about 15 pages, zero filler.

Read straight through from section one, work every example as you go, then use the editing checklist at the end to test what you've learned on your own writing.

Contents

  1. 1 The Independent Clause: The Building Block You Need First
  2. 2 Fragments: Sentences That Aren't Quite Sentences
  3. 3 Run-Ons and Comma Splices: Two Sentences Crashing Into One
  4. 4 The Five Fixes: A Toolkit for Joining (or Separating) Clauses
  5. 5 When the 'Rules' Bend: Stylistic Fragments and Splices in Real Writing
  6. 6 Editing Your Own Draft: A Practical Checklist
Chapter 1

The Independent Clause: The Building Block You Need First

Every sentence-boundary error in this book — fragments, run-ons, comma splices — comes down to one question: does this group of words form a complete, standalone thought? To answer that, you need to be able to recognize an independent clause.

An independent clause is a group of words that contains a subject and a predicate and expresses a complete thought. The subject is who or what the sentence is about. The predicate is what the subject does, is, or experiences — it always contains a verb. Put those two things together and you have something that can stand on its own as a sentence.

  • The dog barked. — subject: the dog; predicate: barked. Complete.
  • She revised her essay three times. — subject: she; predicate: revised her essay three times. Complete.

Both of those can end with a period and no one will complain. That's the test: read the group of words. Does it feel finished? Could it end with a period and make sense? If yes, you're probably looking at an independent clause.

What a Predicate Actually Requires

The predicate must contain a finite verb — a verb that is marked for tense (past, present, future) and agrees with its subject. This matters because verb forms that look like verbs but don't carry tense can fool you.

Running down the street has the word running, but running here is not a finite verb. It doesn't tell you when this action happens or who is doing it. There's no subject-verb relationship that completes a thought. That's a phrase — a group of words that lacks either a subject, a finite verb, or both. Phrases cannot stand alone as sentences. This is exactly the kind of word group that creates fragments, which Section 2 covers in detail.

Compare:

  • She was running down the street. — was running is a finite verb phrase (past progressive). Independent clause.
  • Running down the street. — no finite verb, no subject. Phrase only. Not a sentence.

Dependent Clauses: Almost, But Not Quite

Now here's where students most often get tripped up. A dependent clause also has a subject and a finite verb — so it looks exactly like an independent clause at first glance. The difference is one extra word at the front: a subordinating conjunction.

Keep reading

You've read the first half of Chapter 1. The complete book covers 6 chapters in roughly fifteen pages — readable in one sitting.

Coming soon to Amazon