Punctuation is the silent conductor of your writing. It guides the reader, dictates pauses, and clarifies meaning. Even small errors can trip up your audience or, worse, change the intended message entirely. Let's look at 22 of the most common punctuation mistakes and how to steer clear of them.
Comma Catastrophes
Commas are notorious for causing trouble. They're versatile, but their overuse or underuse can lead to confusion.
1. The Comma Splice
This happens when you join two independent clauses with only a comma. An independent clause can stand alone as a complete sentence.
- Incorrect: The dog barked, the cat hissed.
- Correct: The dog barked; the cat hissed. (Use a semicolon)
- Correct: The dog barked, and the cat hissed. (Use a conjunction)
- Correct: The dog barked. The cat hissed. (Separate sentences)
2. Missing Comma After Introductory Element
When a phrase or clause comes before the main part of the sentence, you usually need a comma.
- Incorrect: After the rain stopped we went outside.
- Correct: After the rain stopped, we went outside.
3. Missing Comma in a Series
When listing three or more items, you need commas between each item. The comma before the final "and" or "or" (the Oxford comma) is optional but often recommended for clarity.
- Incorrect: We bought apples oranges and bananas.
- Correct: We bought apples, oranges, and bananas.
4. Unnecessary Commas
Don't put commas where they don't belong. This often happens between a subject and its verb or between a verb and its object.
- Incorrect: The book, I read yesterday was fascinating.
- Correct: The book I read yesterday was fascinating.
5. Comma with Nonessential Clauses/Phrases
If a clause or phrase adds extra information but isn't crucial to the sentence's core meaning, set it off with commas.
- Incorrect: My brother who lives in Boston is visiting. (Implies you have more than one brother)
- Correct: My brother, who lives in Boston, is visiting. (Implies you have only one brother, and he lives in Boston)
Apostrophe Agonies
Apostrophes signal possession or contractions. Misusing them is a quick way to make your writing look unprofessional.
6. Incorrect Pluralization with Apostrophes
Apostrophes do NOT make words plural.
- Incorrect: The dog's were barking.
- Correct: The dogs were barking.
7. Incorrect Possessive of Singular Nouns
For most singular nouns, add 's.
- Incorrect: The girls dress was blue.
- Correct: The girl's dress was blue.
8. Incorrect Possessive of Plural Nouns
For plural nouns ending in 's', just add an apostrophe. For irregular plurals not ending in 's', add 's.
- Incorrect: The students papers were graded.
- Correct: The students' papers were graded.
- Incorrect: The childrens toys were scattered.
- Correct: The children's toys were scattered.
9. Confusing "Its" and "It's"
"It's" is a contraction of "it is" or "it has." "Its" is possessive.
- Incorrect: The cat chased it's tail.
- Correct: The cat chased its tail.
- Incorrect: Its a beautiful day.
- Correct: It's a beautiful day.
10. Confusing "Your" and "You're"
"You're" is a contraction of "you are." "Your" is possessive.
- Incorrect: Your going to love this.
- Correct: You're going to love this.
- Incorrect: What is you're favorite color?
- Correct: What is your favorite color?
11. Confusing "Their," "There," and "They're"
- "Their" shows possession.
- "There" indicates a place or is used to start sentences.
- "They're" is a contraction of "they are."
- Incorrect: Their going to the park over there.
- Correct: They're going to the park over there.
Semicolon and Colon Conundrums
These two marks can be powerful when used correctly, but they're often misused.
12. Overuse of Semicolons
Use semicolons to join two closely related independent clauses, or to separate items in a complex list.
- Incorrect: I like pizza; it's delicious. (This is a comma splice issue, but semicolons can fix it.)
- Correct: I like pizza; it's my favorite food.
13. Semicolons with Conjunctions
Don't use a semicolon before a coordinating conjunction (and, but, or, for, nor, so, yet) if it's joining two independent clauses.
- Incorrect: The weather was bad; so we stayed inside.
- Correct: The weather was bad, so we stayed inside.
14. Colon Misplacement
Colons introduce lists, explanations, or quotes after an independent clause.
- Incorrect: I need: milk, eggs, and bread.
- Correct: I need the following items: milk, eggs, and bread.
- Correct: She had one goal: to win.
Quotation Mark Quandaries
Punctuation marks often have specific relationships with quotation marks.
15. Incorrect Placement of Commas and Periods with Quotation Marks
In American English, commas and periods almost always go inside the closing quotation mark.
- Incorrect: He said, "I'm tired."
- Correct: He said, "I'm tired."
- Incorrect: "That's great", she replied.
- Correct: "That's great," she replied.
16. Incorrect Placement of Semicolons and Colons with Quotation Marks
Semicolons and colons typically go outside the closing quotation mark.
- Incorrect: He used the phrase "to err is human"; it was a fitting quote.
- Correct: He used the phrase "to err is human"; it was a fitting quote.
Dash and Hyphen Dilemmas
These marks look similar but serve different purposes.
17. Confusing Hyphens and Dashes
Hyphens join words to create compound words (e.g., well-being, mother-in-law). Dashes (en dash and em dash) are used for breaks in thought or to set off clauses.
- Incorrect: The well being of the community is important.
- Correct: The well-being of the community is important.
- Incorrect: She was a brilliant — and sometimes difficult — artist. (This commonly uses an em dash)
- Correct: She was a brilliant—and sometimes difficult—artist.
18. Hyphenating Adverbs Ending in -ly
You generally don't hyphenate adverbs ending in -ly that modify adjectives.
- Incorrect: A brightly lit room.
- Correct: A brightly lit room.
Other Common Pitfalls
19. Missing Period at the End of a Sentence
This seems basic, but it's a common oversight. Every complete sentence needs a terminal punctuation mark.
- Incorrect: The meeting ended at five
- Correct: The meeting ended at five.
20. Overuse of Exclamation Points
While they add emphasis, too many exclamation points can make your writing seem unprofessional or juvenile.
- Incorrect: Wow! That's amazing! I can't believe it!!!
- Correct: Wow, that's amazing! I can't believe it.
21. Incorrect Use of Parentheses
Parentheses should enclose supplementary information that is not essential to the sentence's meaning. Don't put a comma before an opening parenthesis.
- Incorrect: The report (which was very long) was due today.
- Correct: The report, which was very long, was due today.
- Correct: The report (it was very long) was due today.
22. Missing Apostrophe in Contractions
Contractions require apostrophes to show where letters have been omitted.
- Incorrect: Its a shame.
- Correct: It's a shame.
- Incorrect: I cant wait.
- Correct: I can't wait.
Mastering these common punctuation errors takes practice, but the payoff is clearer, more professional writing. If you're struggling to get your punctuation just right, EssayGazebo.com offers AI humanization and professional editing services that can help polish your work to perfection.