-s -ss -sh -ch -x and -z form their plural.
buses; glasses; brushes; watches; boxes; prizes
by ading -s in Singular
day - days
mother - mothers
Nouns with ending in -o (Lietvārdi kas beidzas ar -o) add - es in the Plural (pievieno -es daudzskaitlim).
hero- heroes
potato - potatoes
tomato - tomatoes
Nouns ending in - y (lietvārdi kas beidzas ar -y ) changed to - i and add -es (nomaina uz - i un pievieno -es).
city - cities
country - countries
But Nouns with -y preceded by a vowel (patskani) add - s in the plural
day - days
boy - boys
ray - rays
Some nouns ending in - f or - fe change to - v and add -es in the plural.
leaf - leaves
life - lives
half - halves
A few nouns form their plural by changing the root vowel (mainot saknes patskani)
man - men
woman - women
tooth - teeth
foot - feet
mouse - mice
Compounds with man change to men in the plural:
postman - postmen
workman - workmen
snowman - snowmen
Englishman - Englishmen