Click on the lessons below:

• ERROR 12: MIXED CONSTRUCTIONS AND FAULTY PREDICATION
• ERROR 11: FAULTY SUBORDINATION AND COORDINATION
• ERROR 10: WORDINESS AND REDUNDANCY
• ERROR 9: OVERUSE OF PASSIVE VOICE
• ERROR 8: INCONSISTENT VERB TENSE
• ERROR 7: FAULTY PARALLELISM
• ERROR 6: DANGLING AND MISPLACED MODIFIERS
• ERROR 5: UNCLEAR PRONOUN REFERENCE
• ERROR 4: PRONOUN AGREEMENT ERRORS
• ERROR 3: SUBJECT-VERB AGREEMENT ERRORS
• ERROR 2: RUN-ON SENTENCES AND COMMA SPLICES
• ERROR 1: SENTENCE FRAGMENTS

Introduction

Writing clear, correct sentences is one of the most important skills in English. Even learners who speak English well often struggle with certain sentence-level errors that appear repeatedly in their writing. These errors can confuse readers, weaken arguments, and create a poor impression — even when the writer has excellent ideas.

This guide covers the twelve most common and significant sentence-level errors in American English writing. For each error, you will find:

1. A clear definition explaining what the error is and why it matters

2. Explicit rules to follow to avoid the error

3. Ten example pairs showing the incorrect form and the corrected version

4. An extended dialogue showing the error in realistic conversation, with annotations

Study each section carefully. Practice rewriting the incorrect examples yourself before looking at the corrections. Over time, recognizing these errors in your own writing will become natural.

12 major sentence errors:

1. Sentence Fragments
2. Run-On Sentences & Comma Splices
3. Subject-Verb Agreement
4. Pronoun Agreement
5. Unclear Pronoun Reference
6. Dangling & Misplaced Modifiers
7. Faulty Parallelism
8. Inconsistent Verb Tense
9. Overuse of Passive Voice
10. Wordiness & Redundancy
11. Faulty Subordination & Coordination
12. Mixed Constructions & Faulty Predication

Each section includes a thorough definition, explicit rules, 10 color-coded example pairs (wrong ✗ in red / correct ✓ in green), and a realistic extended dialogue with inline annotations explaining why each error occurs.

Conclusion: Building Sentence-Level Accuracy

Mastering the twelve major sentence errors covered in this guide will dramatically improve the quality, clarity, and professionalism of your writing in American English. Learning to recognize these errors is the first step; training yourself to avoid them automatically in your own writing is the goal.

Here is a brief summary of the twelve errors for quick reference:

1. Sentence Fragments — Ensure every sentence has a subject, a main verb, and a complete thought.

2. Run-On Sentences and Comma Splices — Join independent clauses with a period, semicolon, or coordinating conjunction. A comma alone is not enough.

3. Subject-Verb Agreement — Make the verb agree with its true subject in number, not with nearby nouns.

4. Pronoun Agreement — Match every pronoun to its antecedent in number and type.

5. Unclear Pronoun Reference — Every pronoun must refer clearly and unambiguously to a specific noun.

6. Dangling and Misplaced Modifiers — Place modifiers next to the words they describe. Introductory phrases must be followed by the noun they describe.

7. Faulty Parallelism — Items in a list or comparison must be in the same grammatical form.

8. Inconsistent Verb Tense — Maintain a consistent tense throughout your writing unless a logical shift is required.

9. Overuse of Passive Voice — Prefer active voice for directness and clarity. Use passive only when purposeful.

10. Wordiness and Redundancy — Use the fewest words needed to express your meaning precisely.

11. Faulty Subordination and Coordination — Use the correct conjunction to show the logical relationship between ideas. Place main ideas in main clauses.

12. Mixed Constructions and Faulty Predication — Ensure that every sentence’s grammatical structure is consistent from beginning to end.

To continue improving, practice writing one or two sentences using each of these patterns correctly every day. Read your own writing aloud — your ear will often catch errors that your eye misses. Use the checklist questions from the dialogues in this guide when proofreading: Who is the subject? Does the verb agree? Is the modifier in the right place? Are all listed items parallel? Is the pronoun reference clear? The writers who improve most rapidly are not those who make the fewest errors, but those who learn most quickly to identify and correct the errors they make. Every error is a learning opportunity. Keep writing, keep editing, and keep growing.