To make regular nouns plural, add –s to the end.

Example:
cat – cats

house – houses

If the singular noun ends in –s, –ss, –sh, –ch, –x, or –o, you usually add -es to the end to make it plural.

Example:
bus-buses
dress-dresses
box-boxes
church-churches
brush-brushes
potato-potatoes

If a singular noun ends in –y and the letter before the –y is a consonant, you usually change the ending to –ies to make the noun plural.
Example: baby-babies

If the singular noun ends in –y and the letter before the –y is a vowel, simply add an –s to make it plural.
Example: toy-toys

Nouns ending in -y

Irregular nouns

Irregular nouns follow no specific rules, so it’s best to memorize these:

child – children

goose – geese

man – men

woman – women

tooth – teeth

foot – feet

mouse – mice

person – people

Nouns ending in -f or -fe, add -ves in the plural

Example:
wolf-wolves
wife-wives