, a book - books, a cat - cats, a car - cars, a house - houses, a tree - trees, a dog - dogs, a hat - hats, a child - children, a woman - women, a man - men, a mouse - mice, a tooth - teeth, a foot - feet, a goose - geese, a fish - fish, a deer - deer, a sheep - sheep, a person - people, a goose - geese.