Introduction:
Most English nouns form their plurals by simply adding ''-s'' or ''-es'' (e.g., ''book - books'', ''box - boxes''). However, some words change completely or do not change at all in the plural form. These are called irregular plurals.
Examples of Irregular Plurals:
man - men
woman - women
child - children
foot - feet
mouse - mice
Some nouns stay the same in singular and plural:
sheep - sheep
deer - deer
Irregular plurals must be memorized because they do not follow normal rules!
Vocabulary:
Man - Men
Woman - Women
Child - Children
Person - People (except in formal or legal contexts)
Foot - Feet
Tooth - Teeth
Mouse - Mice
Goose - Geese
Ox - Oxen
Fish - Fish (Same in singular and plural)
Sheep - Sheep (Same in singular and plural)
Deer - Deer (Same in singular and plural)
Cactus - Cacti
Leaf - Leaves
Knife - Knives