Class 5 is the one that quietly unsettles English speakers, because it breaks a deep expectation: that a plural should look different from a singular. In this class — the zero plural — the indefinite singular and the indefinite plural are identical. Ett hus is "a house"; två hus is "two houses." Nothing is added. The number lives entirely in the surrounding words (a numeral, många "many", flera "several") or in the definite ending — never in the bare noun itself. This is less exotic than it feels: English does exactly the same with sheep, deer, fish, aircraft. The difference is that Swedish does it systematically, for two well-defined groups. This page covers both groups, the four-form paradigm with its split definite plural, and how to read number off a sentence when the noun gives nothing away.
Group one: consonant-final ett-words
The core of class 5 is neuter (ett) words ending in a consonant. For these the indefinite plural takes no ending at all — singular and plural are spelled and pronounced the same:
ett hus → två hus · ett barn → tre barn · ett rum → fyra rum · ett bord → många bord
This mirrors the clean gender-and-sound logic from class 4: an ett-word ending in a vowel adds -n (äpple → äpplen), while an ett-word ending in a consonant adds nothing (hus → hus). So for any neuter noun, the last letter decides: vowel → -n, consonant → zero. Knowing the gender (always store ett hus, not bare hus) plus glancing at the final sound gives you the plural with no further memorising.
De bygger tre nya hus på vår gata.
They're building three new houses on our street. ett hus → tre hus — no ending; the numeral carries the plural.
Hur många rum har lägenheten?
How many rooms does the flat have? ett rum → (många) rum — singular and plural look identical.
Paret har två barn och en hund.
The couple have two children and a dog. ett barn → två barn — note 'barn' is also 'children', unchanged.
Group two: the -are agent nouns
The second group is a gift of predictability, and it is large. En-words ending in -are — overwhelmingly agent nouns, names for someone who does something — also take a zero plural. En lärare ("a teacher") is två lärare ("two teachers"); en läkare ("a doctor") is flera läkare ("several doctors"):
en lärare → två lärare · en läkare → läkare · en arbetare → arbetare · en spelare → spelare
This is a huge, open, productive class — you can coin a new -are noun from almost any verb (simma "swim" → en simmare "a swimmer"), and it automatically has a zero plural. Naming this subgroup saves you from treating each word as a one-off irregular: the moment a noun ends in -are, you know its indefinite plural is identical to the singular. (The formation of these nouns is covered on Agent Nouns.)
Skolan har anställt tre nya lärare i höst.
The school has hired three new teachers this autumn. en lärare → tre lärare — zero plural.
Det stod flera läkare och sjuksköterskor i korridoren.
Several doctors and nurses were standing in the corridor. läkare → läkare (unchanged).
Laget letar efter två snabba spelare.
The team is looking for two fast players. spelare → spelare.
The full paradigm: a split definite plural
Here is where the two groups part ways, and it is the one thing in this class you must keep straight. The indefinite forms are alike (no plural ending), but the definite plural differs by gender:
- consonant-final ett-words add -en in the definite plural: hus → husen, barn → barnen.
- -are en-words add -na in the definite plural, dropping the final -e: lärare → lärarna, läkare → läkarna.
| Indef. sing. | Def. sing. | Indef. plural | Def. plural | Meaning |
|---|---|---|---|---|
| ett hus | huset | hus | husen | house |
| ett barn | barnet | barn | barnen | child |
| ett rum | rummet | rum | rummen | room |
| ett bord | bordet | bord | borden | table |
| en lärare | läraren | lärare | lärarna | teacher |
| en läkare | läkaren | läkare | läkarna | doctor |
So the definite plural is where number finally becomes visible on the ett-words: hus (one or many houses, ambiguous) but huset (the house) versus husen (the houses) is now unmistakable. Note ett rum → rummen: the doubled m of the definite forms is regular spelling for a short stressed vowel. And note that the -are nouns drop their -e before -na (lärare → lärar + na = lärarna), exactly as they do nowhere else in the paradigm.
Husen på andra sidan gatan revs förra året.
The houses across the street were torn down last year. ett hus → hus → husen (definite plural -en).
Lärarna strejkar nästa vecka.
The teachers are striking next week. en lärare → lärare → lärarna (definite plural -na, -e dropped).
Vi flyttade borden ut på terrassen.
We moved the tables out onto the terrace. bord → bord → borden.
How to know it's zero, not something else
Two boundaries keep this class clean. First, a vowel-final ett-word is not class 5 — it is class 4 and adds -n (äpple → äpplen), so don't extend the zero plural to äpple. Second, a handful of consonant-final en-words that look like they belong here actually have irregular plurals with umlaut — en mus → möss, en man → män — and live on Irregular and Foreign Plurals, not here. The reliable zero-plural en-words are the -are agents (plus a few like en meter → meter, en liter → liter among measures).
❌ Antagande: 'en mus → mus' (zero plural)
A warning: this looks like it could be zero, but 'mus' is irregular: en mus → möss.
✅ en mus → möss
a mouse → mice — irregular, not a zero plural.
Orthography: nothing added, but watch the definite plural
In the indefinite plural there is, by definition, nothing to spell — the word is unchanged, and any å/ä/ö in it simply stays (ett tält → tält "tent", ett träd → träd "tree"). The only spelling to mind is the definite plural: ett-words take -en (husen, barnen, träden) and the -are en-words take -na with the -e dropped (lärarna, not lärarena). Mixing these up — husna or lärarena — is the classic slip.
Träden i parken har redan tappat löven.
The trees in the park have already lost their leaves. ett träd → träd → träden (the ä stays; definite plural -en).
Common Mistakes
❌ ett hus → huser / husar / huss
Incorrect — consonant-final ett-words add NO plural ending.
✅ ett hus → hus
a house → houses — zero plural; the numeral or context shows number.
❌ tre barns / två rums
Incorrect — no English -s plural. The plural is the unchanged 'barn' / 'rum'.
✅ tre barn / två rum
three children / two rooms.
❌ en lärare → lärarer (inventing an ending)
Incorrect — the -are agent nouns are zero-plural: lärare → lärare.
✅ en lärare → lärare
a teacher → teachers — unchanged in the indefinite plural.
❌ lärarena for 'the teachers'
Incorrect — the -are nouns drop their -e and take -na: lärarna.
✅ lärarna
the teachers — definite plural -na, no -e.
❌ husna for 'the houses'
Incorrect — consonant-final ett-words take -en in the definite plural, not -na.
✅ husen
the houses — definite plural -en.
Key Takeaways
- Class 5 is the zero plural: indefinite singular and plural are identical (ett hus → två hus), as with English sheep and fish.
- Two groups: consonant-final ett-words (hus, barn, rum, bord) and the large, productive family of -are agent nouns (lärare, läkare, spelare).
- Number is read from context — a numeral, många/flera, or the definite ending — not from the bare noun.
- The definite plural splits by gender: ett-words add -en (husen, barnen); -are en-words add -na, dropping the -e (lärarna).
- Don't over-extend it: vowel-final ett-words are class 4 (-n), and a few en-words like mus and man are irregular.
Now practice Swedish
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Start learning Swedish→Related Topics
- The Five Plural DeclensionsA2 — Swedish builds plurals through five declension classes — -or, -ar, -er, -n, and a zero ending — not the English -s. This overview names all five, gives a model noun for each, and lays out the prediction rules competitors omit: gender plus the word's final sound forecasts the class about 80% of the time, so the system is far less random than it first looks.
- The Definite PluralA2 — How Swedish says 'the cars / the girls / the houses': you take the indefinite plural and add a second definite suffix — -orna (flickorna), -arna (bilarna), -erna (sakerna), -na (äpplena), and -en for the zero-plural ett-words (husen). The rule of thumb: add -na to vowel-ending plurals, -en to consonant-ending zero plurals. Plus the dangerous look-alike: husen ('the houses') vs the -en that elsewhere marks the definite SINGULAR.
- Agent Nouns (-are, -ör, -ist)B1 — How Swedish names the person who does something. The native suffix -are is enormously productive and builds en-words with a ZERO plural (en lärare → flera lärare) and a -na definite plural (lärarna) — so once you recognise an -are noun you never have to memorise its plural. Loan suffixes -ör (frisör), -ist (journalist) and -er (musiker) cover internationalisms, while the old feminine forms -inna/-ska (lärarinna) are now largely obsolete: en lärare is gender-neutral.
- Irregular and Foreign PluralsB1 — The plurals that escape the five regular declensions: suppletive natives (en man → män, en mus → möss, en gås → gäss, en ko → kor), the Old Norse -on body-part plurals (ett öga → ögon, ett öra → öron), and Latin/Greek loan plurals (ett museum → museer, ett centrum → centra/centrum, en examen → examina). Small closed lists to memorise — not rules to apply — plus the honest note that some Latin plurals are optional.