What role do pronouns play?

Pronouns are small Words that take the place of a noun in a sentence. We can use a pronoun instead of a noun. When we use pronouns, we don't have to repeat the same noun every time we refer to it, and pronouns help sentences flow more smoothly and make them easier to say.

Examples:
Mary and John have asked for volunteers to help Mary and John paint Mary and John's house.
OR, using pronouns:
Mary and John have asked for volunteers to help thempaint their house.

Sandy got a new puppy. Sandy's new puppy got Sandy's new puppy's paws in the mud and tracked Sandy's new puppy's muddy footprints all over Sandy'skitchen floor.
OR
Sandy got a new puppy. Her new puppy got his paws in the mud and tracked his muddy footprints all over her kitchen floor.