Number

The Czech language distinguishes between singular (one subject) and plural (two and more subjects).

Singular: jednotné číslo
Plural: množné číslo

In most cases, the plural form is formed by changing the ending of the singular.

Masculine:
adding -I to the singular of animate nouns
adding -Y to the singular of inanimate nouns

hrad - hrady (a castle - castles)
pán - páni (a gentleman - gentlemen)

Feminine:
adding -Y to the singular

dívka - dívky (a girl - girls)

Neuter:
adding -A or -I to the singular

tělo - těla (a body - bodies)
dítě - děti (a child - children)

Some nouns have only the plural form for both singular and plural.

jedno moře - dvě moře (one see - two seas)
jedna rukavice - dvoje rukavice (one glove - two gloves)

Sometimes the stem of the singular must be further modified (in that case, the correct plural form can be derived from the model noun).