Why Sentence Structure Matters: A Brief History
Clear sentence structure hasn't always been a priority in English writing. In the earliest periods of the language, sentences could stretch for dozens of lines without any punctuation at all. Over centuries, grammarians, educators, and writers worked to establish rules that make communication more effective. Understanding this evolution helps you see that the rules you learn today aren't arbitrary — they exist because writers discovered, through trial and error, that well-structured sentences transfer ideas more reliably from one mind to another.
Today, every major standardized test — including the GED Reasoning Through Language Arts exam — evaluates your ability to recognize and fix structural errors. The three biggest offenders are run-on sentences, sentence fragments, and wordiness. If you can spot and correct these three problems, you'll dramatically improve both your writing score and the clarity of everything you communicate.
Core Principles: What Makes a Sentence Work
Before you can fix broken sentences, you need to understand what a correct sentence looks like. Every grammatically complete sentence in English must contain a subject (who or what the sentence is about) and a predicate (what the subject does or is). It must also express a complete thought — meaning a reader should not feel left hanging when the sentence ends. These three elements form the foundation of every principle that follows.
Run-On Sentences
Sentence Fragments
Wordiness
Independent vs. Dependent Clauses
Visualizing Sentence Errors
The diagram below illustrates the three major sentence-structure errors alongside their corrected forms. Study how each error type looks when diagrammed, and notice the specific fix applied in each case. Recognizing these patterns visually will help you identify errors more quickly on the GED.
Notice how each correction strategy directly addresses the root cause of the error. Run-ons need a boundary between the two independent clauses — a period, semicolon, or conjunction. Fragments need the missing piece restored — either by attaching the fragment to a nearby sentence or by adding the missing subject or verb. Wordiness is fixed by stripping away redundancy until every word earns its place.
How Each Error Works (and How to Fix It)
Run-On Sentences: Two Trains, One Track
A fused sentence smashes two independent clauses together with no punctuation at all: "The alarm rang I jumped out of bed." A comma splice inserts only a comma: "The alarm rang, I jumped out of bed." Both are run-ons because a comma alone is too weak to separate two full sentences.
- Fix 1 — Period: The alarm rang. I jumped out of bed.
- Fix 2 — Semicolon: The alarm rang; I jumped out of bed.
- Fix 3 — Comma + Coordinating Conjunction (FANBOYS): The alarm rang, and I jumped out of bed.
- Fix 4 — Subordination: When the alarm rang, I jumped out of bed.
Sentence Fragments: Missing Pieces
Fragments come in several forms. A dependent-clause fragment begins with a subordinating word (because, although, since, when, if) but is not attached to a main clause: "Although she practiced every day." A phrase fragment lacks a subject, a verb, or both: "Running through the park at sunset." A missing-verb fragment has a subject but no true verb: "The committee responsible for organizing the event." In each case, the reader is left waiting for information that never arrives.
- Fix 1 — Attach to a nearby sentence: Although she practiced every day, she still felt nervous before the recital.
- Fix 2 — Add the missing element: She was running through the park at sunset.
- Fix 3 — Remove the subordinating word: She practiced every day.
Wordiness: Saying Less to Mean More
Wordiness sneaks into writing in predictable ways. Redundant pairs repeat the same idea ("each and every," "true and accurate"). Filler phrases add bulk without meaning ("due to the fact that" instead of "because," "in order to" instead of "to"). Unnecessary passive voice hides the actor and stretches the sentence ("The ball was thrown by Marcus" instead of "Marcus threw the ball"). On the GED, the most concise answer that preserves the original meaning is almost always correct.
Classifying and Diagnosing Errors
On test day, you'll face sentences that might contain one error, multiple errors, or no error at all. A systematic diagnostic approach saves time and boosts accuracy. The flowchart below walks you through the decision-making process you should use every time you encounter a sentence-structure question.
| Error Type | Common Signal Words / Patterns | Quick Fix |
|---|---|---|
| Fused Sentence | Two complete ideas with no punctuation between them | Insert a period or semicolon, or add a comma + FANBOYS conjunction |
| Comma Splice | A lone comma between two independent clauses | Replace comma with semicolon, add conjunction after the comma, or split into two sentences |
| Dependent-Clause Fragment | Starts with because, although, since, when, if, while, unless | Attach to the sentence before or after it |
| Phrase Fragment | Starts with -ing, to + verb, or a prepositional phrase — no subject/verb combo | Add a subject and/or a main verb |
| Redundancy | Phrases like "each and every," "past history," "completely finished" | Delete the unnecessary word |
| Filler Phrases | "Due to the fact that," "in order to," "it is important to note that" | Replace with a single word: because, to, (delete entirely) |
Worked Example: Revising a Paragraph
Below is a short draft paragraph riddled with all three types of sentence-structure errors. We'll walk through diagnosing and fixing each one, just as you would on the GED.
Comparing Fix Strategies: Strengths and Trade-Offs
There is rarely a single "right" way to fix a sentence error — but on the GED, you need to choose the best answer among the options provided. The table below compares common correction strategies so you can evaluate which fix produces the clearest, most concise result.
| Strategy | Strengths | Limitations |
|---|---|---|
| Split into two sentences (period) | Always grammatically safe; easy to apply; creates punchy, short sentences | Can make writing feel choppy if overused; loses logical connections between ideas |
| Use a semicolon | Shows that two ideas are closely related; sophisticated option | Both clauses must be independent; overuse feels pretentious |
| Add comma + FANBOYS | Clarifies the logical relationship (and, but, so, etc.); natural flow | Must choose the right conjunction; comma is required before the conjunction |
| Subordination (because, although, when) | Shows cause-effect or contrast clearly; varies sentence length for better rhythm | The subordinated clause must remain attached; if separated, it becomes a fragment |
| Trim and tighten (wordiness fix) | Improves clarity and brevity; usually the preferred GED answer | Cutting too much can change meaning; must verify meaning is preserved |
Connecting to Advanced Writing Skills
Eliminating run-ons, fragments, and wordiness is foundational, but strong writing extends far beyond fixing errors. Once you master these basics, you can begin focusing on sentence variety, parallel structure, and rhetorical effectiveness — skills that appear on more advanced exam sections and in college-level writing.
| Basic Skill (This Lesson) | Advanced Extension |
|---|---|
| Fix run-on sentences by splitting or joining | Deliberately vary sentence length for rhythm: mix short punchy sentences with longer complex ones to hold the reader's attention |
| Fix fragments by adding missing elements | Use intentional fragments for stylistic effect in creative or persuasive writing (rare on the GED but common in published prose) |
| Eliminate wordiness by cutting filler | Choose words with precision: select the exact verb or noun that conveys your idea, reducing the need for adjectives and adverbs |
| Use subordination to fix run-ons | Employ parallel structure in lists, comparisons, and paired constructions for balanced, professional prose |
As you prepare for the GED and potentially for college-level writing, remember that the skills in this lesson aren't just test tricks — they are the building blocks of all effective communication. Writers who control their sentence structure can shape how readers think and feel, one clear sentence at a time.
Practice Problems
Test your skills with these five problems. Each one escalates in difficulty. For every problem, identify the error type (if any), then write or select the best correction.
Lesson Summary
Effective sentence structure depends on eliminating three major error types. Run-on sentences — including fused sentences and comma splices — occur when two or more independent clauses are joined without proper punctuation or a conjunction. Fix them with a period, semicolon, or comma + FANBOYS conjunction. Sentence fragments are missing a subject, a verb, or a complete thought — fix them by attaching the fragment to a nearby sentence or by adding the missing element. Wordiness — caused by redundant pairs, filler phrases, and unnecessary passive voice — is eliminated by choosing the most concise phrasing that preserves the original meaning.
On the GED, use a systematic diagnostic approach: first check for a subject and verb (fragment test), then check for improperly joined clauses (run-on test), and finally ask whether the sentence can be stated more concisely (wordiness test). When multiple answer choices are grammatically correct, the GED favors the shortest correct option. Mastering these three skills will improve not just your test score but every piece of writing you produce.