Apostrophe Rules: Plural vs. Possessive (Complete Guide with Examples)
Summary
Apostrophes
Apostrophes are punctuation marks (’) that show when something belongs to someone or to show a missing letter. The hardest part of using apostrophes correctly is knowing when to add one for possessives and when NOT to add one for plurals.
Apostrophes:
● Plural → usually don’t add an apostrophe
● Possessive → apostrophe means ownership
And because both versions can look similar on a page, the grammar rules are easily confused and often break down—especially in academic and business writing.
Getting it right means you know how to create clear sentences and polished writing.
Why It Matters
When you use apostrophes incorrectly, it matters for three big reasons.
1. Reader Clarity
If you use the wrong apostrophe or miss one altogether, it can have a totally different meaning.
● students books
What does it mean? It’s unclear.
● students’ books
What does it mean? The books belong to the students.
● student’s books
What does it mean? The books belong to one student.
With the right punctuation marks, there’s no confusion or ambiguity, and your reader instantly knows what you’re trying to say.
2. Writing Professionalism
When you use the wrong apostrophe in a report, email, essay, or application, it’s considered a simple grammar mistake. When you know how to use plural and possessive apostrophes correctly, you’ll go up in credibility as a writer every time.
3. Consistent with Any Style
Academic writing, business writing, digital writing—they all require the same apostrophe rules. And the best part is that once you understand the logic behind plural vs. possessive apostrophe use, you can apply it almost without thinking about it.
When Do You Use Apostrophes? (Plural vs. Possessive)
Ok, here’s the good stuff. Below you’ll find the most common use cases for plurals and possessives in the real world.
1. To Show a Singular Possession: Add ’s
To show something belongs to a single noun, add ’s.
● the cat’s toy
● the manager’s decision
● the company’s revenue, which increased last year.
2. To Show a Plural Possession: Add ’
If the plural noun ends in -s already, only add ’.
● the teachers’ lounge (the lounge of the teachers)
● the customers’ feedback, which was positive.
But if the plural doesn’t end in -s, add ’s.
● the children’s playground
● the men’s department
3. To Make Regular Plurals (Usually No Apostrophe)
With almost every regular plural, don’t use an apostrophe.
● Correct: books, tables, ideas, Monday mornings
● Incorrect: book’s, table’s, idea’s, (unless you’re showing something belongs to it)
4. To Make Plurals of Abbreviations, Letters & Numbers (Usually No Apostrophe)
A lot of people get tripped up here, but make it plural, like any other word.
● Correct: DVDs, CEOs, 1990s, URLs
Exception:
To avoid confusion of single letters, add ’s.
● Mind your p’s and q’s.
● He got three A’s on his report card.
5. To Show Amounts or Time Expressions: Add ’s
These are considered possessive in meaning, so add ’s.
● a day’s work
● two weeks’ notice
● a dollar’s worth
6. To Show Possession with Names Ending in “s”: Add ’s or Just ’
There are two styles and both are correct, just be consistent.
● Option A (most guides): Add ’s
- James’s book
- Charles’s car
● Option B: Add ’ only
- James’ book
- Charles’ car
Plural vs. Possessive Examples
Here are tons of examples to make the rules stick.
Regular Nouns
Type | Example |
|---|---|
Singular possessive | the dog’s collar |
Plural possessive | the dogs’ collars |
Just plural | the dogs barked loudly |
Irregular Nouns
Type | Example |
|---|---|
Singular possessive | the child’s toy |
Plural possessive | the children’s toys |
Just plural | the children are playing |
Names Ending in “s”
Type | Example |
|---|---|
Singular possessive | Chris’s laptop |
Alternate form | Chris’ laptop |
Time Expressions
Type | Example |
|---|---|
Singular possessive | a moment’s thought |
Plural possessive | three days’ rest |
Plural vs. Possessive: Comparison Table
Form | Rule | Example |
|---|---|---|
Plural (no apostrophe) | More than one noun | cats, teachers, laptops |
Singular possessive (’s) | One noun owns something | the cat’s tail |
Plural possessive (’) | Plural ending in -s owns something | the cats’ toys |
Irregular plural possessive (’s) | Plural doesn’t end in -s | the children’s books |
Its (no apostrophe) | Possessive pronoun | The dog ate its food. |
It’s (with apostrophe) | Contraction of “it is” | It’s raining. |
How to Type an Apostrophe on Windows, Mac, Google Docs, HTML & Mobile
Apostrophes are simple to type, but choosing the correct form (straight vs. curly) can matter in design and publishing.
Windows
Standard apostrophe: ’
Shortcut: Press the main keyboard apostrophe key next to Enter.
Mac
Type apostrophe: ’
Shortcut: Same as Windows — press the apostrophe key.
For curly apostrophe: the system auto-formats in most apps.
Google Docs
Automatically converts to curly apostrophes.
To prevent auto-correction:
Tools → Preferences → uncheck “Use smart quotes.”
HTML
Use these entities:
Symbol | Code |
|---|---|
’ (apostrophe) | ' or ' |
’ (right single quote) | ’ |
iPhone / Android
Hold down the apostrophe key to select between:
● Straight apostrophe '
● Curly apostrophe ’
Common Mistakes & Writing Tips
1. Using Apostrophes to Form Regular Plurals
● Incorrect: apple’s, book’s, photo’s
● Correct: apples, books, photos
2. Confusing Its vs. It’s
● its = possessive
● it’s = it is / it has
Quick test:
If you can replace it with “it is,” use it’s.
3. Adding Apostrophes After Verbs
● Incorrect: The manager decide’s the schedule.
Why? Apostrophes never belong in verbs.
4. Overusing Apostrophes in Names
● Incorrect: We invited the Smith’s.
● Correct: We invited the Smiths.
5. Inconsistent Style for Names Ending in “s”
Pick one style (James’s or James’) and apply it throughout your document.
Conclusion
Apostrophes may look small, but they play a major role in clarity and correctness. By understanding the difference between plurals (no apostrophe) and possessives (apostrophe shows ownership), you can avoid common grammar mistakes and elevate your writing.
To summarize:
● Use ’s for singular possession.
● Use s’ for plural nouns ending in -s.
● Use ’s for irregular plural possession.
● Never use apostrophes for regular plurals.
● Watch out for special cases like its vs. it’s, names ending in s, and time expressions.
Master these rules, and apostrophe usage becomes intuitive, consistent, and professional across all forms of writing.
