Plurals

+s
an apple-apples

+ES(if nouns ending in –s,-ss,
-ch,-x,-o)
a tomato-tomatoes

BUT:
radio-radios
piano-pianos
photo-photos
rhino-rhinos
hippo-hippos
video-videos

in the plural
Nouns ending in a vowel+Y take –s
a toy-toys

Nouns ending in consonant+y, drop the –y and take –ies in the plural
a strawberry-strawberries
y-i+es

Nouns ending in –f or –fe, drop the f or fe and take –ves in the plural
a leaf-leaves
-f/-fe-v+es

BUT:
chiefs
roofs
safes
cliffs
beliefs
scarf(ves)
wharfs(ves)
dwarfs(ves)
hoofs(ves)

IRREGULAR PLURALS:
a man-men
a woman-women
a child-children
a foot-feet
a tooth-teeth
a goose-geese
a mouse-mice
a louse-lice
an ox-oxen