Possessive nouns
A possessive noun is a noun that shows ownership, belonging or a close relationship between two things or people. It is usually formed by adding an apostrophe and "s" ('s) to a singular noun, or just an apostrophe to a plural noun ending in s, as in "the girl's book" or "the students' books".
Types of possessive nouns
Singular possessive
Formed by adding apostrophe + s to a singular noun to show one owner.
e.g. the dog's lead, Maria's car, the boss's office
Plural possessive
Formed by adding just an apostrophe to a plural noun that already ends in s.
e.g. the teachers' lounge, the students' results, the birds' nests
Irregular plural possessive
Formed by adding apostrophe + s to plural nouns that do not end in s.
e.g. the children's toys, the men's room, the people's choice
Joint possessive
Shows shared ownership between two or more nouns by adding the possessive only to the last noun.
e.g. Tom and Anna's house, Jack and Mia's business
Individual possessive
Shows separate ownership by adding the possessive to each noun in a list.
e.g. Tom's and Anna's cars, the doctor's and the nurse's notes
Rules to remember
- Add 's to a singular noun to show possession, even if it already ends in s (e.g. James's phone).
- Add only an apostrophe to a regular plural noun ending in s (e.g. the parents' garden).
- Add 's to irregular plural nouns that do not end in s (e.g. the women's team).
- For joint ownership, add the possessive form only to the last noun in the pair; for separate ownership, mark each noun.
- Do not use an apostrophe to form an ordinary plural noun; apostrophes show possession or contraction, not plurality.
Examples in sentences
| Example | How it works |
|---|---|
| The cat's tail was covered in mud. | Singular possessive noun 'cat's' shows the tail belongs to one cat. |
| The workers' union voted to strike. | Plural possessive noun 'workers'' shows something belonging to many workers. |
| The children's playground was recently renovated. | Irregular plural 'children' takes 's to form the possessive. |
| Sam and Lily's flat overlooks the river. | Joint possessive: only 'Lily' takes 's because they share the flat. |
| Sam's and Lily's opinions on the film were completely different. | Individual possessive: each noun takes its own 's because the opinions are separate. |
| James's essay scored the highest mark in class. | Singular noun ending in s still takes 's for possession. |
| The company's profits rose sharply last year. | Singular possessive noun used with an abstract, non-living owner. |
Common mistakes
Incorrect: The dog's are barking loudly.
Correct: The dogs are barking loudly.
Incorrect: Its a lovely day for the picnic.
Correct: It's a lovely day for the picnic.
Incorrect: The students opinion's were ignored.
Correct: The students' opinions were ignored.
Why this matters for IELTS
Accurate use of possessive nouns boosts your Grammatical Range and Accuracy score because examiners notice apostrophe errors quickly, even in otherwise strong sentences. Using varied possessive forms correctly, such as singular, plural and joint possession, shows control of a wider range of structures rather than repeating simple "of" phrases, which can help push your writing and speaking scores towards band 7 or higher.
Frequently asked questions
What is a possessive noun?
A possessive noun is a noun form that shows ownership or a relationship, usually made by adding an apostrophe and s ('s) to a singular noun or just an apostrophe to a plural noun ending in s.
How do you make a noun possessive if it already ends in s?
Most style guides recommend still adding 's, as in James's book, though adding only an apostrophe (James' book) is also accepted, especially for classical or plural names.
What is the difference between a possessive noun and a plural noun?
A plural noun simply shows more than one of something (dogs), while a possessive noun shows ownership (dog's or dogs'); apostrophes are never used to create an ordinary plural.
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