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An Ideal KISS Grammar Curriculum Sequence?
c. 1863-1867
Oil on panel
Musée du Petit Palais
Paris, France
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    An apostrophe is used to show that something in some way belongs to someone: 

Anthony's house
Sharon's idea
the town's streets.
Usually, the noun with the apostrophe can be replaced by an "of" phrase:
the house of Anthony
the idea of Sharon
the streets of the town
To use an apostrophe, first, make the noun either singular or plural. Then add the apostrophe:
the player's pieces = the pieces of one player
the players' pieces = the pieces of all the players