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4. Singular nouns ending in ‘y’, form their plurals by adding ‘ies’.

City Cities Lily Lilies

Army Armies Activity Activities

Baby Babies Fly Flies

Duty Duties Library Libraries

Story Stories Theory Theories

Fairy Fairies Dairy Dairies

5. Singular nouns ending in 'y', but vowels are before it. The plurals are formed
by adding ‘s’ only.

Boy Boys Day Days

Play Plays Donkey Donkeys

Essay Essays Monkey Monkeys

Toy Toys Joy Joys

Guy Guys Play Plays

6. Singular nouns ending in ‘f’, ‘fe’, form their plurals by adding ‘ves’.

Leaf Leaves Knife Knives

Calf Calves Thief Thieves

Loaf Loaves Wolf Wolves

Wife Wives Life Lives

7. Some singular nouns do not follow any rule. They are called exceptional plurals.

Foot Feet Child Children

Man Men Fish Fish

Woman Women Goose Geese

Tooth Teeth Ox Oxen

Mouse Mice Sheep Sheep

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