Plural Nouns and Possessives
Grade 3 · English · Study Guide
Learn how to write about more than one thing and show ownership.
A noun is a word that names a person, place, or thing. When you have MORE than one of something, you need the PLURAL form. Most of the time, making a plural is simple — just add -s. One dog, two dogs. One book, three books. But English has some interesting special cases that you need to know.
If a word ends in -s, -sh, -ch, -x, or -z, you add -es instead of -s. One bus, two buses. One lunch, three lunches. If a word ends in a consonant + y, change the y to i and add -es. One city, two cities. One butterfly, three butterflies. Some nouns are IRREGULAR — they change completely. One child, two children. One mouse, three mice. One tooth, many teeth. You just have to memorize these!
POSSESSIVES are a completely different tool. They show that something BELONGS to someone or something. To show possession for a singular noun (one owner), add an apostrophe + s: the dog's bone, Maria's backpack. For a PLURAL noun that ends in -s, just add an apostrophe AFTER the s: the dogs' water bowls, the students' projects. For irregular plurals that don't end in -s, add apostrophe + s: the children's playground, the mice's cheese.
The difference between 'dogs' (plural: more than one dog) and 'dog's' (possessive: belonging to one dog) might look tiny, but it changes the meaning completely. That little apostrophe does a big job!
| Rule | Ending | Example |
|---|---|---|
| Add -s | Most words | cat → cats, book → books |
| Add -es | -s, -sh, -ch, -x, -z | bus → buses, lunch → lunches |
| Change y to i, add -es | Consonant + y | city → cities, baby → babies |
| Irregular | No rule — memorize! | child → children, tooth → teeth |
Key terms
- plural noun
- A noun that refers to more than one person, place, or thing
- irregular plural
- A plural noun that does not follow the standard -s or -es rule (child → children)
- possessive noun
- A noun that shows ownership using an apostrophe
- apostrophe
- The punctuation mark (') used to show possession or replace letters in contractions
Flashcards
- plural noun
- More than one of something — usually formed by adding -s or -es
- irregular plural
- A plural that doesn't follow normal rules: child→children, tooth→teeth, mouse→mice
- possessive noun
- Shows ownership using an apostrophe: dog's bone (one dog), dogs' bones (many dogs)
- apostrophe + s ('s)
- Used for singular possessives: Maria's backpack
- apostrophe after s (s')
- Used for plural possessives ending in -s: the students' projects
Practice questions
What is the correct plural of 'lunch'?
- lunchs
- lunches
- lunchi
- lunchies
Show answer
Answer: lunches
'Lunch' ends in -ch, so add -es: lunches.
To show that a book belongs to one student, you write: 'the student's book'.
Show answer
Answer: True
For one owner (student), use apostrophe + s: 'student's book.'
The plural of 'child' is ___.
Show answer
Answer: children
'Child' is an irregular noun — it doesn't just add -s. The plural is 'children.'
Which sentence uses a possessive correctly?
- The dogs bowl is empty.
- The dog's bowl is empty.
- The dogs' bowl is empty of mine.
- The dog bowl's is empty.
Show answer
Answer: The dog's bowl is empty.
One dog owns the bowl, so use 'dog's' (apostrophe + s) for singular possessive.
The plural of 'city' is 'citys'.
Show answer
Answer: False
'City' ends in consonant + y, so change y to i and add -es: cities.
Fun facts
- The word 'data' is actually already plural! The singular is 'datum.' Scientists often say 'the data are...' — not 'is.'
- Some words are the same singular and plural — like 'sheep,' 'deer,' and 'fish.' One sheep, ten sheep!
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