When a noun is in possessive form, (for example, Julie's in the phrase Julie's book), this possessive form is functioning like an adjective, telling which book is being referred to.

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The possessive form of a noun (e.g., Julie's) functions like an adjective by modifying another noun (e.g., book) to indicate ownership or a relationship, thereby specifying which book is being referred to.

When a Noun Is in Possessive Form, (For Example, Julie's