A farmer - farmers
a country - countries
a city - cities
a day - days
a leaf - leaves
an address - addresses
a lemon - lemons
an apple - apples
a child - children
a man - men
a house - houses
a mouse - mice
a tooth - teeth
a photo - photos
hair - только единственное число
a potato - potatoes
a box - boxes
a hobby - hobbies
an exercise-book - exercise-books
a piano - pianos
a son-in-law - sons-in-law
a wife - wives
a gallery - galleries
а woman - women
a toy - toys
a roof - roofs
a foot - feet
money - только единственное число.
Объяснение: