Common Mistakes

Most writing problems are the same handful of problems, repeated. Learn to spot them and you'll catch most of your own errors before anyone else does.

Grammar Mistakes

1. Subject-Verb Agreement

Error: Subjects and verbs don't match in number.

Rule: Singular subjects take singular verbs; plural subjects take plural verbs.

Tricky: Ignore phrases between subject and verb.

2. Pronoun-Antecedent Disagreement

Error: Pronouns don't match their antecedents.

Modern solution: Use plural to avoid gender issues.

• Everyone → All students must bring their books.

3. Run-on Sentences

Error: Two independent clauses joined incorrectly.

Wrong: I love writing it helps me think clearly.

Fixes:

• Period: I love writing. It helps me think clearly.
• Semicolon: I love writing; it helps me think clearly.
• Comma + Conjunction: I love writing, and it helps me think clearly.
• Subordination: I love writing because it helps me think clearly.

4. Comma Splices

Error: Two independent clauses joined with only a comma.

Wrong: I write daily, it improves my skills.

Fixes: (Same as run-ons)

• Period
• Semicolon
• Comma + conjunction
• Subordination

5. Sentence Fragments

Error: Incomplete sentence missing subject, verb, or complete thought.

Wrong:

• Because I was tired.
• Running down the street.
• A beautiful day in the park.

Right:

• I left early because I was tired.
• I saw him running down the street.
• It was a beautiful day in the park.

Exception: Fragments are OK in informal writing for emphasis.

• Question? Answer.
• Can't find words? Try this.

6. Misplaced Modifiers

Error: Modifier is too far from what it modifies.

Rule: Place modifiers next to what they modify.

7. Dangling Modifiers

Error: Modifier has nothing to modify.

Rule: Make sure the modifier's subject is in the sentence.

8. Wrong Verb Tense

Error: Inconsistent or incorrect tense use.

Wrong: I walked to the store and buy bread. Then I go home.

Right: I walked to the store and bought bread. Then I went home.

Rule: Keep tense consistent unless time actually changes.

9. Incorrect Pronoun Case

Error: Using wrong pronoun form.

Trick: Remove the other person to check.

• "Between I" ✗ → "Between me" ✓

10. Its vs. It's

Error: Confusing possessive with contraction.

Remember: Possessive pronouns never have apostrophes (its, yours, hers, theirs).

Punctuation Mistakes

1. Comma Before "And" in Compound Sentences

Error: Missing comma before coordinating conjunction.

Wrong: I wrote the draft and she edited it.

Right: I wrote the draft, and she edited it.

Rule: Use comma before and, but, or, nor, for, so, yet when joining two complete sentences.

No comma: I wrote the draft and edited it. (one subject)

2. Apostrophe Errors

Common mistakes:

Rules:

• Plurals: no apostrophe (dogs, cats, books)
• Possessives: add 's (dog's bone, James's book)
• Contractions: use apostrophe (don't, it's, you're)

3. Semicolon Misuse

Error: Using semicolons incorrectly.

Wrong: I love writing; because it helps me think.

• "Because it helps me think" isn't independent.

Right: I love writing; it helps me think.

• Both sides are independent clauses.

Wrong: Dear Sir; I am writing to apply. Right: Dear Sir: I am writing to apply. (use colon in salutation)

Rule: Semicolons join two independent clauses or separate complex list items.

4. Quotation Mark Placement

American English: Periods and commas go inside quotation marks.

Right: He said, "I'm leaving." Right: She wrote an article called "Writing Tips," which was popular.

Wrong: He said, "I'm leaving". Wrong: She wrote "Writing Tips", which was popular.

Exception: Question marks and exclamation points go inside only if they're part of the quote.

• He asked, "Are you coming?"
• Did he say "I'm leaving"?

Word Choice Mistakes

1. Commonly Confused Words

2. Redundant Phrases

Error: Using two words when one suffices.

3. Weak Intensifiers

Error: Using weak modifiers instead of strong words.

Rule: Choose stronger base words instead of propping up weak ones.

4. Vague Words

Error: Using generic words instead of specific ones.

5. Clichés

Error: Using overused phrases that lack impact.

Style Mistakes

1. Passive Voice Overuse

Error: Using passive when active is clearer.

When passive is OK:

• Unknown actor: "The window was broken."
• Unimportant actor: "The product was recalled."
• Emphasis on receiver: "The president was elected."

2. Wordiness

Error: Using more words than necessary.

3. Monotonous Sentence Structure

Error: Every sentence has the same pattern.

Monotonous:

I woke up. I made coffee. I checked email. I started work. I took a break. I finished the project.

Varied:

I woke up and made coffee. After checking email, I started work. An hour later, I took a break before finishing the project.

4. Inconsistent Tone

Error: Switching between formal and informal randomly.

Wrong:

The research methodology employed rigorous protocols. But honestly, the results were pretty dang cool.

Right (formal):

The research methodology employed rigorous protocols. The results were significant and compelling.

Right (informal):

We used solid research methods. And honestly, the results were pretty cool.

5. Weak Openings

Error: Starting with filler or obvious statements.

Weak openings:

• "In today's society..."
• "Since the beginning of time..."
• "The dictionary defines X as..."
• "This essay will discuss..."
• "I am going to write about..."

Strong openings:

• Hook with question, statistic, or bold statement
• Jump straight to your point
• Start with compelling anecdote

Organization Mistakes

1. No Clear Thesis

Error: Reader doesn't know your main point.

Vague: This paper is about writing.

Clear: Daily practice, combined with active reading, dramatically improves writing skills.

2. Burying the Lead

Error: Important information comes too late.

Wrong structure:

[5 paragraphs of background] [Finally, the main point]

Right structure:

[Introduction with main point] [Supporting details]

3. Lack of Transitions

Error: Abrupt jumps between ideas.

Abrupt:

Practice improves writing. Reading is also important. Feedback helps too.

Smooth:

Practice improves writing. In addition, reading exposes you to effective techniques. Finally, feedback reveals blind spots and accelerates improvement.

4. Paragraphs Without Topic Sentences

Error: Reader doesn't know what the paragraph is about.

Solution: Start each paragraph with a clear topic sentence.

5. Weak Conclusions

Error: Ending abruptly or just repeating the introduction.

Weak endings:

• "In conclusion, I have shown..."
• "As you can see..."
• "That's all I have to say."
• [Exact repetition of introduction]

Strong endings:

• Synthesize main points
• Call to action
• Broader implications
• Memorable final thought

Revision Mistakes

1. Not Taking Breaks

Error: Revising immediately after writing.

Why it's a problem: You're too close to see issues.

Solution: Wait 24 hours before revising.

2. Only Fixing Typos

Error: Proofreading without addressing big-picture issues.

Solution: Edit structure first, then sentences, then mechanics.

3. Over-Editing

Error: Revising indefinitely, losing your voice.

Solution: Set a limit (e.g., 5 revisions) and know when to stop.

4. Ignoring Feedback

Error: Dismissing reader comments because you disagree.

Solution: Listen without defending. Look for patterns.

5. Trusting Tools Blindly

Error: Accepting every Grammarly suggestion without thinking.

Solution: Understand why the tool suggests changes. You decide.

Practice Exercises

Exercise 1: Fix Grammar Errors

Correct the errors:

1. The team are ready to start.
2. Between you and I, this is difficult.
3. Everyone must bring their pencil.
4. I love writing it helps me think.
5. Walking down the street, the buildings looked tall.

Answers:

1. The team is ready to start.
2. Between you and me, this is difficult.
3. Everyone must bring his or her pencil. (Or: Students must bring their pencils.)
4. I love writing because it helps me think. (Or: I love writing. It helps me think.)
5. Walking down the street, I saw tall buildings.

Exercise 2: Fix Word Choice

Replace vague/weak words:

1. The thing was very good.
2. I got a new job.
3. The weather was nice.
4. She felt bad about the situation.

Sample Answers:

1. The solution was excellent.
2. I secured a new job.
3. The weather was pleasant and sunny.
4. She felt guilty about the situation.

Exercise 3: Cut Wordiness

Make these concise:

1. In order to succeed, you must practice.
2. Due to the fact that I was tired, I went home.
3. At this point in time, we have no information.

Answers:

1. To succeed, you must practice.
2. Because I was tired, I went home.
3. Currently, we have no information.

Exercise 4: Fix Punctuation

Correct the punctuation:

1. Its been a long day.
2. The dogs bone is missing.
3. I need milk eggs and bread.
4. She said "I'm leaving".

Answers:

1. It's been a long day.
2. The dog's bone is missing.
3. I need milk, eggs, and bread.
4. She said, "I'm leaving."

Quick Reference: Most Common Errors

Top 10 errors to watch for:

1. Subject-verb agreement
2. Its vs. it's
3. Their, there, they're
4. Your vs. you're
5. Run-on sentences and comma splices
6. Missing commas in compound sentences
7. Apostrophe misuse
8. Wrong pronoun case (I vs. me)
9. Vague word choice
10. Passive voice overuse

Summary

Most common mistakes:

• Grammar: subject-verb agreement, pronoun errors, fragments, run-ons
• Punctuation: comma splices, apostrophe errors, misplaced commas
• Word choice: confused words, redundancy, weak intensifiers, clichés
• Style: passive voice overuse, wordiness, monotony, inconsistent tone
• Organization: unclear thesis, no transitions, weak conclusions

Prevention strategies:

• Learn the rules
• Use grammar checkers (but don't trust blindly)
• Read your work aloud
• Take breaks before revising
• Get feedback from others

Remember:

• Everyone makes mistakes
• The goal is improvement, not perfection
• Revision fixes most errors
• Learn from your mistakes

Next Steps

Continue to 10-practice-exercises.md to put it all into practice with prompts and drills.