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English Literature & Composition

Run-Ons, Comma Splices & Fragments

Spot the Error, Apply the Fix, Stop Losing Points — A TLDR Primer

You lost points on that essay — but the teacher's comment just says "run-on" or "fragment" and you're not sure what that means or how to fix it. This guide cuts straight to the problem.

**Run-Ons, Comma Splices & Fragments** is a concise, no-filler primer on the three sentence-boundary errors that cost students the most points in English composition. It's built for high school and early college writers who need to understand the rules clearly, apply them fast, and stop making the same mistake twice.

The guide opens by defining the independent clause — the one concept that unlocks everything else. From there it walks through what makes a fragment, how to recognize a fused sentence versus a comma splice, and five reliable fixes you can reach for in any situation. A dedicated section on stylistic fragments and intentional splices in published writing teaches you when the rules can bend and, more importantly, how to tell the difference between a deliberate choice and a careless error. The book closes with a repeatable editing checklist you can run on any draft before you turn it in.

If you're studying for the AP Language exam, prepping a college application essay, or just tired of dropping points on grammar you could easily fix, this guide gives you the tools without the detour through a door-stopper grammar textbook. Short by design, focused on application, and written the way a sharp tutor actually explains it.

Pick it up, read it once, and fix the errors for good.

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 & Fragments cover
TLDR STUDY GUIDES

Run-Ons, Comma Splices & Fragments

Spot the Error, Apply the Fix, Stop Losing Points — A TLDR Primer
Solid State Press

Run-Ons, Comma Splices & Fragments

Spot the Error, Apply the Fix, Stop Losing Points — A TLDR 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.

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.

About This Book

If you are a high school student losing points on essays for grammar errors in your writing, a college freshman looking for English grammar help before a placement test or composition course, or a parent trying to help your kid with grammar homework, this book was written for you. It also works for tutors who need a tight session resource and for anyone prepping to avoid run-ons on essay exams like the SAT, ACT, or AP Language.

This is a focused sentence boundary errors writing primer covering independent clauses, sentence fragments, and how to fix run-on sentences — the kind of guidance usually buried in a comma splice grammar worksheet or scattered across a textbook chapter. Concise and structured, with no filler.

Read it straight through, following along with the worked examples. Then use the practice problems at the end — the sentence fragments practice gives you immediate feedback on whether the concepts have actually landed.

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