Apostrophes: Definition, Rules, Uses & Examples

Apostrophes are small punctuation marks, but they can cause big problems in English writing.

Should you write girl’s, girls’, or girls? What is the difference between its and it’s? And when should you use an apostrophe with a plural noun?

This guide explains apostrophes in simple English. You will learn the apostrophe definition, its main uses, possession rules, contractions, common mistakes, and easy examples.

What Is an Apostrophe?

An apostrophe (’) is a punctuation mark used mainly for two purposes:

1. To show possession or ownership
2. To show missing letters in contractions

Examples

• Sara’s book → the book belongs to Sara.
• The students’ classroom → the classroom belongs to the students.
• I’m → I am.
• Don’t → do not.

The apostrophe is usually placed before or after s, depending on the word and its meaning.

What Does an Apostrophe Mean?

The meaning of an apostrophe depends on how it is used.

Apostrophe for possession

It can show that something belongs to a person, animal, group, or thing.

The teacher’s desk is clean.

The desk belongs to the teacher.

Apostrophe in contractions

It can also show that letters have been removed from two words.

She is → She’s
They are → They’re
Cannot → Can’t

So, apostrophes do not always show ownership.

The Two Main Uses of Apostrophes

Most apostrophe rules fall into two main groups:

This difference is important because ’s can have more than one meaning.

Apostrophes for Possession

A possessive apostrophe shows that one noun owns or is connected to another noun.

The main rule depends on whether the owner is singular or plural.

1. Singular Nouns: Add ’s

For a singular noun, usually add ’s.

Examples

• the boy’s bag
• the girl’s bicycle
• the teacher’s desk
• the dog’s tail
• the student’s book

Example sentence

The girl’s notebook is on the table.

One girl owns the notebook, so we write girl’s.

2. Plural Nouns Ending in S: Add Only an Apostrophe

If a plural noun already ends in s, add an apostrophe after the s.

Examples

• students → students’
• teachers → teachers’
• parents → parents’
• players → players’
• dogs → dogs’

Example sentences

The students’ books are on the desk.

The teachers’ room is upstairs.

Here, more than one student or teacher owns or is connected to the thing.

For a deeper explanation of this specific rule, see our guide to [Apostrophes After S].

3. Plural Nouns That Do Not End in S: Add ’s

Some plural nouns do not end in s. These are often irregular plurals.

Add ’s to these words.

Examples

• children → children’s
• men → men’s
• women → women’s
• people → people’s
• mice → mice’s

Example sentences

The children’s toys are everywhere.

The women’s team won the match.

The men’s shoes are near the door.

Remember:

Plural ending in s → s’
Plural not ending in s → ’s

Apostrophes in Names

Names can also use possessive apostrophes.

Singular names

For most singular names, add ’s.

• Ahmed’s phone
• Sarah’s book
• James’s car
• Maria’s bag

For names that already end in s, you may see both James’s and James’ depending on the style guide being followed. Many modern English resources use James’s as the regular form, while some styles prefer James’.

The important point is to follow the style required by your school, workplace, or publication.

Apostrophes for Contractions

An apostrophe can replace letters that are left out when two words are shortened.

These shortened forms are called contractions.

Common contractions

Examples

I’m ready for school.

She’s my sister.

They’re playing football.

We don’t have enough time.

Contractions are very common in everyday English. They are also common in conversations, messages, and informal writing.

For more help with choosing language for different situations, see our guide to Formal vs Informal English.

Its vs It’s

One of the most common apostrophe mistakes is confusing its and it’s.

Its = possession

Its shows that something belongs to or is connected with something.

The dog wagged its tail.

The company changed its website.

It’s = it is or it has

It’s is a contraction.

It’s cold today.
= It is cold today.

It’s been a long day.
= It has been a long day.

Easy test

Replace it’s with it is or it has.

If the sentence still makes sense, (it’s) is probably correct.

Your vs You’re

These words are also often confused.

Your = possession

Is this your book?

You’re = you are

You’re very kind.

Apostrophes can change the meaning of a word, so check the full form when you are unsure.

Their vs They’re

Their = possession

The students opened their books.

They’re = they are

They’re ready for class.

They’re is a contraction, so the apostrophe replaces the missing letters in they are.

Who’s vs Whose

Who’s = who is or who has

Who’s coming to the party?

Who’s finished the work?

Whose = possession

Whose bag is this?

Whose phone is ringing?

This is another useful example of why apostrophes should not be added just because a word sounds like a possessive form.

Do Not Use Apostrophes to Make Ordinary Plurals

A common mistake is using an apostrophe before s just to make a word plural.

Incorrect

• apple’s
• book’s
• teacher’s
• student’s

when you simply mean more than one.

Correct

• apples
• books
• teachers
• students

An apostrophe is not normally needed to make an ordinary noun plural.

Compare

The student’s book
= the book belongs to one student.

The students’ books
= the books belong to several students.

The students are reading.
= students is simply plural, so no apostrophe is needed.

Apostrophes With Time Expressions

Apostrophes can also appear in expressions of time.

Examples

• a day’s work
• a week’s holiday
• two weeks’ holiday
• a month’s salary
• three months’ experience
• one year’s study
• two years’ experience

The same possession idea applies.

a week’s holiday
= a holiday of one week

two weeks’ holiday
= a holiday of two weeks

Apostrophes and Years

Apostrophes are sometimes used when letters or numbers are left out of a year.

For example:

the ’90s

The apostrophe shows that the first digits have been omitted from 1990s.

However, when simply making a decade plural, use:

1990s

not:

1990’s

The apostrophe is not needed just to make a decade plural.

Apostrophes in Everyday Writing

You will see apostrophes in many common forms of writing.

Signs and notices

• Children’s Shoes
• Women’s Clothing
• Teachers’ Room
• Today’s Special

Messages

• I’m busy.
• Don’t worry.
• It’s okay.
• We’re coming soon.

School and work

Correct apostrophe use is important in school assignments, emails, reports, and other forms of writing.

If you want to improve your overall writing, see our guide to Improve English Writing Skills.

Apostrophe vs Comma vs Quotation Mark

These punctuation marks look different and have different jobs.

Examples

Apostrophe:

Sarah’s book is new.

Comma:

Sarah bought a book, a pen, and a notebook.

Quotation marks:

Sarah said, “This book is interesting.”

Do not confuse an apostrophe with a quotation mark.

Smart Apostrophes

You may see two common apostrophe shapes:

• Straight apostrophe: ‘
• Curly or smart apostrophe: ’

For example:

don’t
don’t

The second form uses a curly apostrophe.

In professionally formatted writing, curly apostrophes are often preferred because they have a more polished appearance.

Apostrophe as a Figure of Speech

The word apostrophe has another meaning in literature.

As a literary device, apostrophe means directly addressing a person who is absent, dead, imaginary, or an object or idea that cannot normally respond.

Example

“O Moon, why are you hiding tonight?”

The speaker addresses the Moon directly as if it could respond.

This literary meaning is different from the punctuation mark discussed in most of this article.

Common Apostrophe Mistakes

Here are some mistakes English learners often make.

Mistake 1: Using an apostrophe for a normal plural

❌ I bought three book’s.

✅ I bought three books.

Mistake 2: Confusing its and it’s

❌ The cat cleaned it’s paws.

✅ The cat cleaned its paws.

Mistake 3: Using ’s with a regular plural possessive

❌ The students’s books are on the table.

✅ The students’ books are on the table.

Mistake 4: Forgetting the apostrophe in a contraction

❌ Dont worry.

✅ Don’t worry.

Mistake 5: Confusing your and you’re

❌ Your very helpful.

✅ You’re very helpful.

A Simple Trick to Remember Apostrophe Rules

When you see an apostrophe, ask:

Question 1: Is it showing possession?

If yes, check whether the owner is singular or plural.

• one student → student’s
• several students → students’
• children → children’s

Question 2: Is it a contraction?

If yes, the apostrophe usually replaces missing letters.

• do not → don’t
• I am → I’m
• they are → they’re

Question 3: Is it just a normal plural?

If yes, you usually do not need an apostrophe.

• books
• cars
• students
• teachers

Quick Apostrophe Guide

Apostrophes Practice Worksheet

Choose the correct form.

1. The (girl’s / girls) bag is blue.
2. The (girls’ / girl’s) bags are blue.
3. The (children’s / childrens’) books are on the table.
4. (Its / It’s) raining today.
5. The dog hurt (its / it’s) leg.
6. (Your / You’re) very good at English.
7. The (teachers’ / teacher’s) room is upstairs.
8. I (dont / don’t) understand this rule.
9. I was born in the (1990s / 1990’s).
10. (They’re / Their) going to the library.

Answers

1. girl’s
2. girls’
3. children’s
4. It’s
5. its
6. You’re
7. teachers’
8. don’t
9. 1990s
10. They’re

Examples of Apostrophes in Sentences

Here are some simple examples you can use as a quick reference:

• John’s car is outside.
• The students’ desks are clean.
• The children’s toys are in the box.
• I’m ready for the test.
• She’s my best friend.
• Don’t open the door.
• The cat is licking its paw.
• It’s very hot today.
• Who’s at the door?
• Whose book is this?
• The teachers’ meeting starts at three.
• I lived there in the 1990s.

Why Apostrophes Matter

A small apostrophe can change the meaning of a sentence.

Compare:

The student’s books

This means the books belong to one student.

The students’ books

This means the books belong to several students.

Good punctuation makes your writing easier to understand. It is especially useful when you write assignments, emails, messages, and other important documents.

For broader help with clear written communication, see our guide to English Communication Skills.

Related Guide: Apostrophes After S

One of the most confusing apostrophe rules is knowing when the apostrophe should come after s.

For example:

• students’
• teachers’
• parents’
• girls’

This normally happens when a plural noun already ends in s, and you want to show possession.

Our dedicated guide Apostrophes After S explains this rule in more detail, including plural nouns, names ending in s, common mistakes, and clear examples.

Quick Recap

Remember these simple rules:

• Singular possession → ’s
  → the girl’s bag
• Plural ending in s → s’
  → the girls’ bags
• Irregular plural → ’s
  → the children’s books
• Contraction → apostrophe replaces missing letters
  → do not → don’t
• Normal plural → no apostrophe
  → books, students, cars
• its = possession
  → The dog hurt its paw.
• it’s = it is / it has
  → It’s cold.

Conclusion

Apostrophes become much easier when you first ask what the word is doing in the sentence. Check for possession, contraction, or a simple plural, and the correct form becomes clearer.

Keep practicing these small rules, and your English writing will become cleaner and more confident. For more useful English grammar and writing lessons, keep learning with EnglishLearningHelp.com.

FAQ’s

Previous Post

Say vs Tell: What’s the Difference? Easy Rules, Examples & Exercises

---

Next Post

Apostrophes After S: Easy Rules, Examples & Common Mistakes

Latest Posts

How Many Words Are in English? Dictionary Counts vs the Words You Actually Need

---

17 Oct 2026

42

English Grammar Basics: A Simple Guide for Beginners

---

12 Oct 2026

79

30 Common Grammar Mistakes in English (And How to Fix Them)

---

10 Oct 2026

75

Please Write Your Comments

Comments (0)

Leave your comment.

Add Comment +

INSTRUCTIONS:

• Be Respectful
• Stay Relevant
• Stay Positive
• True Feedback
• Encourage Discussion
• Avoid Spamming
• No Fake News
• Don't Copy-Paste
• No Personal Attacks