What's the plural?
Pens

They're books.
Lion
Lions

They're rulers.
Pictures
Pencil-case
Pencil-cases

They're cats.
Family
a) Familys
b) Families
b) Families.

They're ducks.
Cupboards
Cupboard
Horse

They're Pencil Sharpeners.
Story
a) Storys
b) Stories
b) Stories

They're bikes.
Children
Child
Deer
Deer
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They're fish.
Leaf
Leaves

They're lemurs.
Sheep
Sheep
Donkey
a) Donkeys
b) Donkeyes
c) Donkies
d) Donkeyies
a) Donkeys

They're mice.
Person
People

They're numbers.
People
Person