In English, we use a small mark called an apostrophe (') with -s to show that something belongs to someone. 'The boy's book' means the book that belongs to the boy. 'The girl's bag' means the bag that belongs to the girl. The position of the apostrophe matters. 'The boy's book' (apostrophe before the s) means one boy. 'The boys' books' (apostrophe after the s) means more than one boy. Many students miss this small but important difference. They write 'the boys book' (no apostrophe) or 'the boys's book' (apostrophe in the wrong place). Some students avoid possessives entirely and write longer phrases like 'the book of the boy' instead. This lesson covers the main possessive rules at A2 level — 's for singular, s' for plural, and special forms for irregular plurals like 'children' and 'women'.
Before you start — think honestly about your own teaching and experience.
Look at the examples. Answer each question before reading the explanation — this is how your students will learn too.
The boy's book. (= one boy — the apostrophe is before the s)
The boys' books. (= more than one boy — the apostrophe is after the s)
The girl's bag. (= one girl)
The girls' bags. (= more than one girl)
The student's desk. (= one student)
The students' desks. (= more than one student)
The small mark — the apostrophe — changes the meaning. Why is it so important?
The apostrophe shows the difference between one owner and many owners. 'The boy's book' tells the reader there is one boy, who has a book. 'The boys' books' tells the reader there are several boys, who have several books. This is a big difference in meaning, but it is easy to miss because the position of the apostrophe is so small. In speech, the difference is often impossible to hear — 'boy's' and 'boys'' sound the same. But in writing, the apostrophe is essential. A student who writes 'the boys book' has missed the apostrophe entirely. A student who writes 'the boys's book' has the apostrophe in the wrong place. Native readers notice these errors immediately. Teaching the position rule — apostrophe before the s for one, after the s for many — is the most important step in this lesson.
A: A book belonging to one boy → ________
B: Books belonging to many boys → ________
C: A school for many children → ________
D: A house belonging to my mother → ________
Which form fits each: the boy's book / the boys' books / the children's school / my mother's house?
A: the boy's book — one boy, apostrophe before the s. B: the boys' books — many boys, apostrophe after the s. C: the children's school — 'children' is already plural (no -s ending), so we add 's at the end like a singular: children + 's = children's. D: my mother's house — one mother, apostrophe before the s. The fourth example shows the rule for proper nouns and singular relations: just add 's. The third example shows the rule for irregular plurals (children, men, women): treat them like singulars for the apostrophe — children's, men's, women's. Students often get this wrong because the noun is plural in meaning, but the rule depends on the spelling, not the meaning. Children does not end in -s, so it follows the singular rule — apostrophe before the s.
The dog wagged its tail. (= the tail belonging to it — no apostrophe)
It's a beautiful day today. (= it is — the apostrophe shows a missing letter)
The school is proud of its students. (= the students of the school — no apostrophe)
It's raining outside. (= it is raining — the apostrophe shows the missing i)
Why is 'its' different from other possessives like 'the boy's'?
Most possessives use an apostrophe with -s: the boy's, the girl's, my mother's, the school's. But 'its' (showing possession by it) is a special case — it has no apostrophe. This is because the apostrophe in English has another job: it shows missing letters. 'It's' (with apostrophe) means 'it is' or 'it has' — the apostrophe stands for the missing letter (i in is, ha in has). To avoid confusion, English does not use the apostrophe for the possessive 'its'. So 'the dog wagged its tail' (possession — no apostrophe) is different from 'it's a sunny day' (it is — with apostrophe). Students often confuse these two and produce errors. The rule: if you can replace it with 'it is' or 'it has', use the apostrophe (it's). If you mean belonging to it, no apostrophe (its). The same applies to other pronouns: his, hers, theirs, ours, yours — all are possessive pronouns and none take an apostrophe.
| Pattern | Description | Examples | Notes |
|---|---|---|---|
| Singular noun + 's | For one owner | the boy's book / my mother's house / the school's library / the cat's tail | The standard pattern for showing one owner. |
| Plural noun ending -s + ' (just apostrophe) | For more than one owner | the boys' books / the students' desks / the dogs' tails / the parents' meeting | For plurals already ending in -s, just add the apostrophe after the s — no extra s needed. |
| Irregular plural + 's | For irregular plural owners | the children's school / the men's club / the women's group / the people's choice | Words like children, men, women, people are already plural but do not end in -s, so they follow the singular pattern. |
| Singular name ending in -s + 's | For names ending in -s | James's car / Charles's house / Thomas's bag | In British English, names ending in -s usually still take 's: James's. Some writers use just James' but James's is standard. |
| Possessive pronouns — NO apostrophe | Pronouns that show possession | its tail / his book / her bag / their school / our house / your turn | NEVER use an apostrophe with these. Its (no apostrophe) = belonging to it. It's (with apostrophe) = it is. |
| It's vs its | The most common confusion | It's a sunny day. (= it is) / The dog wagged its tail. (= belonging to it) | If you can say 'it is' or 'it has' instead, use 's. If not, no apostrophe. |
| Things belonging to things | For non-living owners | the school's policy / the book's cover / the city's centre | The 's pattern works for things too, not just people. But longer phrases also work: the policy of the school. |
PATTERN 1 — Singular owners: Add 's to show one owner has something. The boy's book = the book that belongs to one boy. My mother's house = the house that belongs to my mother. The school's library = the library that belongs to the school. The 's goes after the noun, before any other word.
PATTERN 2 — Plural owners ending in -s: When the plural already ends in -s (boys, girls, students, dogs), just add an apostrophe after the s. The boys' books, the girls' bags, the students' desks. Do not add another s — boys's is wrong. The apostrophe alone is enough.
PATTERN 3 — Irregular plurals: Plurals that do not end in -s (children, men, women, people, mice, feet) follow the singular pattern: add 's at the end. The children's school, the men's club, the women's group, the people's choice. These are common errors because students think they should follow the plural-with-s rule.
PATTERN 4 — Names ending in -s: For singular names ending in -s (James, Charles, Thomas), British English standard is to add 's: James's car, Charles's house. Some writers use just an apostrophe (James') but the 's form is more common in British English. For ancient names, just an apostrophe is also accepted (Jesus' words, Moses' law).
PATTERN 5 — Possessive pronouns are different: Pronouns showing possession (its, his, hers, theirs, ours, yours) never take an apostrophe. The dog wagged its tail (no apostrophe). The book is hers (no apostrophe). This is fixed. The apostrophe in pronouns shows missing letters, not possession.
PATTERN 6 — It's vs its: The most common apostrophe error. 'It's' means 'it is' or 'it has' — the apostrophe shows a missing letter. 'Its' (no apostrophe) means belonging to it. Test: try replacing the word with 'it is'. If the sentence still makes sense, use 's. If not, no apostrophe.
PATTERN 7 — Things owning things: The 's pattern works for non-living things too. The school's policy, the book's cover, the country's flag. Longer phrases with 'of' also work and are sometimes preferred for very long descriptions: the policy of the new government school. Both are correct.
Apostrophe errors are among the most visible writing errors in English, and they are very common at A2 and B1 level. A student who writes 'the boys book' or 'the childrens school' signals immediately that they are still learning the rules. The good news is that the rules are small and learnable. Once students understand the position rule (before s for one, after s for many) and the irregular-plural rule (children's, men's, women's), they can master most situations. The 'its / it's' confusion needs separate attention because it is so common. Teachers should drill the test: 'can you replace it with 'it is'? Yes → it's. No → its.' This simple test prevents almost all errors with this pair.
Use real names from the class to drill possessives. 'This is Maria's book.' 'This is Daniel's pen.' Students take turns describing items in the room using 's. Then move to plurals: 'These are the girls' books.' 'These are the boys' bags.' The real-life context makes the pattern memorable. Avoid testing on rare words — focus on common everyday possessives that students will use immediately.
Complete each sentence with the correct possessive form of the noun in brackets.
Each sentence has an error with possession. Find the error, write the correct form, and explain.
Use this sequence directly in class — guided discovery, no textbook needed. Tap each step to mark it done.
STEP 1 — One owner vs many owners (5 min): Write on the board: 'the boy's book' (one boy) and 'the boys' books' (many boys). Read aloud — they sound the same! Discuss the visual difference: apostrophe before the s for one, after the s for many. The position changes the meaning.
STEP 2 — Drill the singular pattern (5 min): Practise 's for one owner. The boy's book. The girl's bag. The teacher's desk. My mother's house. The dog's tail. Have students produce five examples using items in the classroom or at home.
STEP 3 — The plural pattern (5 min): Practise s' for many owners. The boys' books. The girls' bags. The teachers' room. The students' desks. Stress that the plural already has the s — only the apostrophe is added. No extra s.
STEP 4 — Irregular plurals (5 min): Show that children, men, women, people are already plural but do not end in -s. They follow the singular rule: children's school, men's club, women's group, people's choice. Drill these specifically — they are common errors.
STEP 5 — It's vs its (5 min): Show the most confusing pair. 'It's' = it is. 'Its' = belonging to it. The test: replace with 'it is'. If it works, use 's. If not, no apostrophe. Drill five examples mixing the two: 'It's a sunny day' / 'The dog wagged its tail.' Practise until students can choose correctly.
Use directly in class — copy, adapt, or read aloud. No printing needed.
For each strategy, choose the option that best describes where you are now.
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