Nouns That Do Not Change: One Sheep, Two Sheep
Quick Answer
Some English nouns look exactly the same for one and for many: one deer, two deer. You do not add anything. The words around them — one/two, is/are, this/these — tell the reader how many there are.
See the Pattern First
Nothing changes on the noun. Everything changes around it.
- One deer is eating. Five deer are eating.
- This species is rare. These species are rare.
- He caught one salmon. He caught nine salmon.
- The aircraft was late. All aircraft were late.
This is actually good news: there is no spelling to learn. The only skill is choosing is or are correctly, and a number word usually makes it obvious.
The Full List — 16 Words That Never Change
Notice the pattern in meaning: most are animals you hunt or count in groups.
| One | Many | One | Many |
|---|---|---|---|
| aircraft | aircraft | bison | bison |
| buffalo | buffalo | deer | deer |
| elk | elk | moose | moose |
| salmon | salmon | series | series |
| shrimp | shrimp | software | software |
| species | species | swine | swine |
| trout | trout | tuna | tuna |
| sheep | sheep | offspring | offspring |
These come up often, so they have their own full lesson with more practice: the plural of sheep and the plural of offspring.
Why These Words Stopped Changing
Most of them are animals that people hunted or farmed in groups. When you talk about a whole herd or a whole catch, counting one by one is pointless — so English stopped marking the difference. “Five deer” was all anyone needed.
Series and species are different: they already ended in -s when English borrowed them from Latin, so there was nowhere left to add one.
The noun stays still. Is/are does the work.
Where People Get Caught
Two of these have a second, regular plural with a different meaning:
- shrimps and fishes exist — but they mean different kinds, not more individuals. “Two fishes” = two species.
- softwares is never correct. Software is uncountable: say “three software programs” or “three pieces of software”.
If you want to count them, add a counting word: “three head of cattle”, “two pieces of software”.
Mistakes Learners Make (You Are Not Alone)
These come up in almost every class:
- ✗ two deers → ✓ two deer
- ✗ many sheeps → ✓ many sheep
- ✗ several softwares → ✓ several software programs (software cannot be counted directly)
Adding -s here is a very logical mistake — you are applying the normal rule. English is simply being inconsistent, and that is not your fault.
Your Turn — Quick Quiz
Five questions. Take your time — the table above is still there if you need it.
1. 1. We saw three ____ in the forest.
2. 2. Which sentence is CORRECT?
3. 3. The company bought two new ____.
4. 4. He watched all six ____ of the show.
5. 5. The farmer keeps forty ____.
Keep Going
You have now met words that change a lot and words that do not change at all.
There is one more group left, and it is the oldest of all. These words do not add an ending — the word itself transforms. Foot becomes feet. Goose becomes geese. Where did those come from?
Next lesson: Irregular plurals: foot → feet, goose → geese
Sources
I’m Khamis Maiouf. English is not my first language – I learned it as an adult in the UK, passed Functional Skills Level 2 in English, qualified in Hairdressing at Level 3, and I’m now studying Business at university. For over five years I’ve taught ESOL classes in my community and tutored students through GCSE English. I write every lesson on this site myself, for the learner I used to be.
