Forming plural nouns in Croatian isn't difficult, however in order to create the plural of a noun you have to first determine which gender the noun is.
If you haven't yet learned about noun genders, take a look at our blog post on rules for noun gender in Croatian.
Forming plural nouns in the feminine (ženski rod) and neuter (srednji rod) genders is very straightforward.
The –a at the end of the word changes into –e:
kuća – house kuće
žena – woman žene
stolica – chair stolice
The final –o or –e in the word is always change into –a:
pivo – beer piva
vino – wine vina
sunce – sun sunca
more – sea mora
The rule for masculine (muški rod) is also generally simple, but with a few exceptions:
In most cases the plural is formed by adding an –i at the end:
televizor – TV televizori
prijatelj – friend prijatelji
susjed – neighbor susjedi
A couple more exceptions which we'll deal with later ...
That's enough for now ... for more exercises visit our blog post Croatian Grammar: Plural exercises! :-)
prijatelj – friend Answer prijatelji
prijateljica – friend Answer prijateljice
mlijeko – milk Answer mlijeka
miš – mouse Answer miševi
polaznik – participant Answer polaznici
šišmiš – bat Answer šišmiši
soba – room Answer sobe
sestra – sister Answer sestre
glumac – actor Answer glumci
vlak – train Answer vlakovi