What are plural nouns that don't change?
In English, most nouns change when we make them plural. We usually add -s or -es. But some nouns look the same in singular and plural form. The noun does not change. We use the same word for one thing and many things. This is important to remember!
Common nouns that don't change
Some groups of nouns never change in plural. Animal names like sheep, fish, and deer stay the same. Nouns from other languages like Japanese stay the same too. Some nouns about money and measurement also don't change. Numbers like hundred, thousand, and million can stay the same after a number. We learn these nouns by listening and reading many times.
How to know the difference
You know if a noun is singular or plural by reading the sentence carefully. Look at the verb or the number word. The verb can be singular or plural. Numbers help us too. When you see 'two sheep,' you know it is plural. When you see 'one sheep,' you know it is singular. Context is your best helper!
List of Nouns That Don't Change in Plural
| Category | Singular | Plural | Example Sentence | Note |
|---|---|---|---|---|
| Animals | ||||
| Animals | fish | fish | I caught three fish today. | "Fishes" used for multiple species |
| Animals | sheep | sheep | The farmer has 50 sheep. | Always unchanged |
| Animals | deer | deer | We saw five deer in the forest. | Always unchanged |
| Animals | moose | moose | Two moose crossed the road. | Never "mooses" |
| Animals | bison | bison | A herd of bison roamed the plains. | Also "buffalo" |
| Animals | salmon | salmon | The river was full of salmon. | Common fish name pattern |
| Animals | trout | trout | He caught six trout this morning. | Common fish name pattern |
| Animals | shrimp | shrimp | She ordered a plate of shrimp. | "Shrimps" rarely used |
| Animals | swine | swine | The pen housed dozens of swine. | Formal/literary term for pigs |
| Measurement & Quantity | ||||
| Measurement | dozen | dozen | Buy three dozen eggs. | Only when preceded by a numeral |
| Measurement | hundred | hundred | He earned two hundred dollars. | Also: thousand, million, billion |
| Measurement | percent | percent | Prices rose by five percent. | Never "percents" |
| Measurement | foot | foot or feet | He is six foot tall. | "Foot" used informally in measurements |
| Measurement | head (of cattle) | head | The ranch has 200 head of cattle. | Livestock counting only |
| Nationality & Language | ||||
| Nationality | Japanese | Japanese | There are many Japanese students here. | Same form for singular and plural |
| Nationality | Chinese | Chinese | The Chinese delegation arrived yesterday. | Same form for singular and plural |
| Nationality | Portuguese | Portuguese | Several Portuguese explorers sailed the seas. | Same form for singular and plural |
| Nationality | Swiss | Swiss | The Swiss are known for precision. | Same form for singular and plural |
Formula
✔ Positive
One
+
sheep / fish / deer / moose
+
is
One sheep is white.
Examples
I saw one sheep in the field.
Singular · Animal noun
I saw ten sheep in the field.
Plural · Same form as singular
One fish is swimming in the tank.
Singular · Animal noun
Many fish are swimming in the tank.
Plural · Animal noun
The cost is five hundred dollars.
Number noun · No plural form after numbers
She bought two pairs of jeans.
Plural · Clothing noun
When to use it
Talking about animals
Use animal nouns that don't change when you talk about nature, fishing, or farms.
"There are many fish in this river."
Talking about money
Use money nouns that don't change when you talk about prices or amounts.
"The car costs fifty thousand dollars."
Talking about measurements
Use measurement nouns that don't change when you say distances or weights.
"The bridge is two hundred meters long."
Signal words
one
two
many
several
hundred
thousand
million
sheep
fish
deer
moose
are
is
Common Mistakes
✕
Wrong
I caught two fishes.
✓
Correct
I caught two fish.
Fish does not change in plural. Do not add -es.
✕
Wrong
The deers are running fast.
✓
Correct
The deer are running fast.
Deer stays the same in singular and plural.
✕
Wrong
One sheep are on the hill.
✓
Correct
One sheep is on the hill.
One sheep is singular. Use is, not are.
✕
Wrong
She bought five hundreds books.
✓
Correct
She bought five hundred books.
Hundred does not add -s after a number.
KEY TAKEAWAYS
What to Remember
- Most nouns add -s or -es to become plural, but some nouns never change.
- Animal names like sheep, fish, and deer stay the same in singular and plural.
- Nouns from other languages, such as Japanese words, do not change in plural form.
- Money and measurement nouns often stay the same in both singular and plural forms.
- Use the same word for one thing and many things with these unchanging nouns.