When there are several owners and their regular plural noun already ends in -s, possession is marked with one apostrophe after that s: the students' books, my parents' house.
The possessive form shows a relationship between an owner and a person, animal, place, or object. In the phrase the students' books, the owners are several students, and the objects are books.
An apostrophe after the plural -s helps show that there is more than one owner. The exact relationship comes from the context: it may be ownership, belonging, shared use, or an association with a group.
The students' books are on the table.
The students' books are on the table.
Students — several owners; the apostrophe comes after the plural s.
My parents' house is near the park.
My parents' house is near the park.
Parents is already plural, so we add only an apostrophe.
Structure: plural first, then the apostrophe
First form the regular plural: student → students. Then, if this plural already ends in -s, put an apostrophe after the s: students → students'. After the possessive form, name what is connected with the owners: students' desks.
Do not add another s after the plural s. The forms students's and parents's are incorrect in this meaning.
A word naming a person, thing or idea: student, book, happiness.
The teachers' room is upstairs.
The teachers' room is upstairs.
Teachers ends in -s, so only an apostrophe comes after it.
The dogs' bowls are by the door.
The dogs' bowls are by the door.
Dogs is a regular plural; the possessive form dogs' comes before bowls.
Plurals ending in -es and -ies
The rule applies not only to words that simply add -s. If a regular plural is formed with -es or -ies and ends in the letter s, the apostrophe also comes after the final s.
Therefore, class → classes → classes', and baby → babies → babies'. It is important to look at the complete plural form, not only the singular form.
The classes' projects are on the wall.
The classes' projects are on the wall.
Classes is a regular plural ending in -es; we add an apostrophe after the s.
The babies' toys are in the box.
The babies' toys are in the box.
Babies ends in s, so the possessive form is babies'.
The number of owners and the number of objects
The owner's ending tells us how many owners there are, but it does not determine how many objects there are. The girls' room may be one shared room, while the girls' bikes may be several bicycles.
Choose the form of the following noun according to the meaning of the situation. Do not automatically make it plural just because there is more than one owner.
The sisters' café is open.
The sisters' café is open.
There are several owners, but there is one café, so café remains singular.
The visitors' bags are here.
The visitors' bags are here.
There are several owners and several bags; both nouns are plural for different reasons.
Contrast with nearby forms
For one owner, use 's: the girl's bike. For several regular owners whose plural ends in -s, use only an apostrophe: the girls' bikes.
Irregular plurals without a final -s follow a different rule: children's books, men's shoes. These forms are grammatical, but they belong to a related topic; do not form childrens'.
The girl's bike is blue.
The girl's bike is blue.
Girl — one owner, so the apostrophe comes before s.
The girls' bikes are blue.
The girls' bikes are blue.
Girls — several regular owners, so the apostrophe comes after s.
The children's books are new.
The children's books are new.
Children is an irregular plural without a final s, so 's is needed here; this is outside the current rule.
Where the apostrophe goes
The apostrophe is part of the owner word and comes immediately after the plural s, with no space: players'. The noun naming the related thing comes next: players' bags.
The straight mark ' and the typographic mark ’ perform the same function. Both are acceptable in ordinary answers; if an exercise specifically asks for a straight apostrophe, follow that visible requirement.
Here the apostrophe shows a possessive relationship. It does not mark omitted letters, as in the contractions it's or they're, and it does not create an ordinary plural.
The players' bags are by the door.
The players' bags are by the door.
The apostrophe is attached to players, and bags names the players' things.
The nurses' office is on the left.
The nurses' office is on the left.
Nurses' is a plural possessive form; it is not a contraction.
How to apply the rule in your own sentence
Ask three questions: who is connected with the thing, is there one owner or more than one, and does the complete plural end in -s? If there are several owners and the answer to the last question is yes, add only an apostrophe.
Then check the order: the owner in the possessive form comes before the name of the thing. A form with belong to can also be grammatical, but in an exercise that explicitly asks you to practise s', you must use the possessive form.
These are my friends' keys.
These are my friends' keys.
Several friends → friends; the plural ends in s → friends'.
The customers' orders are ready.
The customers' orders are ready.
The phrase briefly says whose orders are ready and keeps the natural word order.
Common mistakes
Incorrect:The students's desks are clean.
Correct:The students' desks are clean.
Students is already a plural ending in -s, so only an apostrophe is needed after the s.
Incorrect:My parents house is near the park.
Correct:My parents' house is near the park.
An apostrophe is needed after the plural parents for the possessive relationship.
Incorrect:The girls's bikes are outside.
Correct:The girls' bikes are outside.
Girls means several girls and already ends in s; the additional s is unnecessary.
Incorrect:The teachers's room is upstairs.
Correct:The teachers' room is upstairs.
The regular plural teachers forms the possessive with one apostrophe after the s.
Incorrect:The babies's toys are in the box.
Correct:The babies' toys are in the box.
Babies is a regular plural ending in -ies that ends in s; the form babies's is incorrect.
The possessive form names an owner or a group that something is closely connected with. First, put the owner word with an apostrophe, and then the thing, place or person: children's toys — toys belonging to children.
This is not always literal ownership. The women’s team means a team of women, and the children’s teacher means a teacher of children.
How to build it
irregular plural owner + 's + thing/person/place
The children's toys are in the box.
The children's toys are in the box.
Children's comes before toys and shows who the toys belong to.
The women’s team is ready.
The women’s team is ready.
Women’s names the group of people who make up the team; this is a connection, not literal ownership.
Irregular Plural + 's
Children, women, men and people are already plural forms, although they do not end in -s. To form the possessive, add an apostrophe and s to the whole word: children + 's = children's.
Do not add another plural ending. The forms childrens, womens and mens are not needed: the plural meaning is already contained in children, women and men.
How to build it
irregular plural without final -s + 's + noun
noun
—
A word naming a person, thing or idea: student, book, happiness.
The women's bags are on the table.
The women's bags are on the table.
Women is an irregular plural without -s, so we add 's.
The men's shoes are by the door.
The men's shoes are by the door.
Men already means several men; the possessive form is men's.
The people's names are on the list.
The people's names are on the list.
In its ordinary meaning, people is the plural of person, so we use people's.
One Owner and Several Owners
Child's and children's both have 's, but they express different numbers. Child's means one child, while children's means several children. The number is determined by the form of the word before the apostrophe.
Similarly, man's means one man, while men's means several men. The visible 's alone does not show the number without the base word.
This is one child's coat.
This is one child's coat.
Child is singular, so there is one owner.
These are the children's coats.
These are the children's coats.
Children is plural, so there is more than one owner.
Contrast with the Regular Plural Ending in -s
If a regular plural already ends in -s, add only an apostrophe after that s: students' books, girls' bikes. This is a related pattern, not the form used for children, women, men or people.
For an irregular plural without a final -s, the apostrophe comes before the added s: children's, women's, men's, people's.
How to build it
girls + ' → girls'; children + 's → children's
The girls' bikes are outside.
The girls' bikes are outside.
Girls already ends in -s, so we add only an apostrophe after it.
The women's bikes are inside.
The women's bikes are inside.
Women does not end in -s, so we add the complete 's.
The Apostrophe in Writing
The straight apostrophe (') and the typographic apostrophe (’) represent the same form: children's and children’s. The important point is the position of the mark: immediately after the irregular plural and before the added s.
The apostrophe does not create the plural. First, you need the correct plural children, women, men or people, and then 's.
Children's books are here.
Children's books are here.
The straight apostrophe comes after children and before s.
Children’s books are here.
Children’s books are here.
The typographic apostrophe changes the formatting, but not the meaning.
Limits and Transfer to Speech
At A1 level, focus on children's, women's, men's and people's in short everyday phrases. Rare irregular plurals need to be checked separately, and the natural way to name the connection depends on the word.
The mechanical form teeth's is possible in a narrow context where teeth genuinely acts as the owner, but in everyday language tooth colour or the colour of the teeth is more natural. Therefore, we do not practise teeth's here.
In your own answer, identify who the owner is and whether there is more than one owner. For children, women, men or people, put 's after the whole word and add the related noun.
Where are the men's jackets?
Where are the men's jackets?
In the question, the same form men's comes before jackets.
The children's teacher is here.
The children's teacher is here.
Children's naturally shows the connection between a group of children and their teacher.
Common mistakes
Incorrect:The childrens' books are new.
Correct:The children's books are new.
Children is already a plural without a final -s; add 's to it, not s'.
Incorrect:The womens' coats are blue.
Correct:The women's coats are blue.
The correct plural is women; the possessive form is made as women + 's.
Incorrect:The mens' shoes are by the door.
Correct:The men's shoes are by the door.
Men already means several men and needs 's without an additional plural s.
Incorrect:The people' names are on the list.
Correct:The people's names are on the list.
In its ordinary meaning, people is a plural without -s, so it needs the complete 's after it.
When the owner is one person, one animal, or one group, we add ’s after the owner’s name. This immediately shows the relationship between the owner and an object, body part, place, or person.
First we name the owner, then what is connected with them. In the phrase Maria’s bag, Maria names the owner, and bag is the thing connected with her.
How to build it
singular owner + ’s + owned person/thing
This is Maria’s bag.
This is Maria’s bag.
Maria is one owner, so ’s comes after the name.
The cat’s bowl is clean.
The cat’s bowl is clean.
Cat is one animal; ’s shows the relationship between the cat and the bowl.
Form and word order
Put the apostrophe before s: Anna’s phone, the doctor’s office. Do not separate ’s with a space or add another ’s.
English word order begins with the owner: Anna’s bicycle. The English phrase is therefore ordered as the owner followed by the thing owned.
How to build it
Anna + ’s + bicycle → Anna’s bicycle
Omar’s phone is on the desk.
Omar’s phone is on the desk.
The owner Omar comes before the thing phone.
The teacher’s chair is by the window.
The teacher’s chair is by the window.
The singular noun teacher takes ’s as one continuous written form.
Not only literal ownership
Possessive ’s often expresses a family, work, or part-to-whole relationship: my friend’s name, the doctor’s office, the dog’s tail. The thing does not necessarily legally “belong” to the owner.
This form is especially natural for people and animals. It also occurs with organizations, places, and time, but at this level the main skill is confidently naming one owner or one related person.
My friend’s name is Sara.
My friend’s name is Sara.
Name is connected with one friend; it is not an object, but the possessive form is natural.
The dog’s tail is wet.
The dog’s tail is wet.
Tail is part of one animal’s body, so we use dog’s.
’s as a possessive form and as a contraction
The same spelling, ’s, has different roles. Before a following noun, it often shows a relationship: Maya’s bag. Before an adjective or a place expression, Maya’s can be a contraction of Maya is: Maya’s tired.
Look at the word after ’s and at the overall meaning. In Maya’s bag, bag names the thing; in Maya’s at home, at home tells us where Maya is.
Maya’s bag is here.
Maya’s bag is here.
Bag comes after Maya’s, so ’s shows a connection with a thing.
Maya’s tired.
Maya’s tired.
Here Maya’s means Maya is; it is a contraction, not possession.
Names ending in -s: two acceptable styles
If a singular name already ends in s, both styles are possible in modern writing: James’ bike and James’s bike. Both can mean “James’s bicycle.”
Use the style consistently within a text, but do not correct either of these forms as a grammar mistake. In this lesson, both are accepted.
James’ bike is new.
James’ bike is new.
Only an apostrophe is added after James—this is an acceptable style.
James’s bike is new.
James’s bike is new.
’s is added after James—this is also an acceptable style.
The boundary with my, his, her and the of construction
The words my, your, his, her, its, our, and their already show possession, so we do not add ’s after them: my coat, her desk. The form my’s is ungrammatical.
For inanimate things, English often uses of or a noun modifier: the door of the room, the kitchen table. This does not make every ’s form impossible; the choice depends on the type of relationship and established usage.
This is my coat.
This is my coat.
My already has a possessive function, so no apostrophe is needed.
The door of the room is open.
The door of the room is open.
The of construction is natural for a part of an inanimate thing; it is an alternative pattern, not a mistake.
How to use the form in speech
When speaking, first identify who or what you are naming as the owner, and then put that name before the necessary noun. For “Nina’s key,” think Nina + ’s + key.
A possessive group works inside a statement, question, or answer: Nina’s key is here; Is this Nina’s key?; It’s Nina’s. In your own answers, you can use real or invented names.
Nina’s key is on the table.
Nina’s key is on the table.
The complete possessive group Nina’s key is the subject of the sentence.
It’s Nina’s key.
It’s Nina’s key.
The first It’s means It is, while Nina’s before key shows the owner.
Common mistakes
Incorrect:This is Maria bag.
Correct:This is Maria’s bag.
The possessive ’s is needed between the one owner Maria and the thing bag.
Incorrect:Omar’s’s phone is on the desk.
Correct:Omar’s phone is on the desk.
Add the possessive marker only once: Omar’s.
Incorrect:This is my’s coat.
Correct:This is my coat.
My is already a possessive determiner; the additional ’s makes the form ungrammatical.
Incorrect:The bicycle’s Anna is new.
Correct:Anna’s bicycle is new.
The owner Anna must come before the thing bicycle, and ’s attaches to the owner.