The apostrophe (’) is one of the most important punctuation marks in English grammar. It is mainly used to show possession or to form contractions. However, it is also one of the most commonly misused punctuation marks, especially among English learners.
Using apostrophes incorrectly can make writing look unprofessional, particularly in emails, academic writing, and business communication. In this guide, you will learn the essential apostrophe rules, see practical apostrophe examples, and discover the common mistakes that ESL learners should avoid.
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Using Apostrophes for Possession
Apostrophes are commonly used to show that something belongs to someone or something. This is called the possessive apostrophe.
Singular Nouns
The general rule is that the possessive form of a singular noun is created by adding ‘s after the noun.
- Bat owned by Tom – Tom’s bat
- Doll owned by Sarah – Sarah’s doll
- A patient of a doctor – A doctor’s patient
- A baby crying – The baby’s crying
Plural Nouns
The apostrophe placement depends on whether the plural noun already ends in the letter s.
Plural nouns ending in “s”: add only the apostrophe.
- The books of the students – The students’ books
- The playground of the teachers – The teachers’ playground
- The crying of the babies – The babies’ crying
Irregular plural nouns (not ending in s): add ‘s.
- The room belonging to the children – The children’s room
- The work done by men – The men’s work
- The toys belonging to the children – The children’s toys
Special Case: Nouns Ending in “s”
Some singular nouns already end in the letter s, such as James or boss. Modern style guides often accept two forms:
- James’s car
- James’ car
Both are widely accepted, although many modern grammar guides recommend using James’s for clarity.
Using Apostrophes for Contractions
A contraction is a shortened form of a word or phrase created by removing letters and replacing them with an apostrophe.
Contractions are extremely common in spoken English and informal writing.
| Full Form | Contraction |
|---|---|
| I am | I’m |
| Do not | Don’t |
| It is | It’s |
| He would / He had | He’d |
| They are | They’re |
| We have | We’ve |
| She will | She’ll |
Example sentences:
- It is so hot today → It’s so hot today.
- I have not done my homework → I haven’t done my homework.
- They are not here yet → They’re not here yet.
- He said he would see his brother tomorrow → He said he’d see his brother tomorrow.
- I cannot get the cork out of the bottle. Can you try? → I can’t get the cork out of the bottle.
Keep in mind that contractions are usually avoided in very formal or academic writing.
Common Apostrophe Mistakes (The “Greengrocer’s Apostrophe”)
One of the most common mistakes is known as the “Greengrocer’s apostrophe.” This occurs when people incorrectly add apostrophes to plural nouns.
Incorrect:
- Apple’s for sale
- Banana’s only $1
Correct:
- Apples for sale
- Bananas only $1
Possessive Pronouns Do NOT Use Apostrophes
Possessive pronouns already indicate ownership, so they never use apostrophes.
- Yours
- Theirs
- Ours
- Hers
- Its
It’s vs Its
This pair often confuses learners.
- It’s = It is / It has
- Its = possessive form (belonging to it)
Examples:
- It’s raining outside.
- The dog wagged its tail.
Practice Exercises
Choose the correct option in each sentence.
- The (students / students’) books are on the table.
- James (car / car’s) is parked outside.
- (Its / It’s) going to rain today.
- The (children / childrens’) playground is closed.
- I (cant / can’t) find my keys.
Answers: students’, James’s car, It’s, children’s, can’t.
Frequently Asked Questions
Do I put the apostrophe before or after the “s” for plural nouns?
If a plural noun ends in s (like teachers), place the apostrophe after the s → teachers’. If the plural noun does not end in s (like people), add ‘s → people’s.
Is it “it’s” or “its” for possession?
Use its (without an apostrophe) to show possession. It’s always means it is or it has.
Can I use an apostrophe to show the plural of a year?
Usually not. Write 1990s instead of 1990’s unless you are showing possession.
Conclusion
Learning how to use apostrophes correctly is essential for clear and professional writing. By understanding the basic rules for possession, contractions, and avoiding common mistakes like the greengrocer’s apostrophe, you can significantly improve your English writing skills.
Still confused about a specific apostrophe case? Leave a comment below and we’ll help you solve it!