This document discusses possessive nouns and possessive adjectives. It provides examples of how to form singular and plural possessive nouns using apostrophes. Possessive adjectives like "my", "your", "his", etc. can replace possessive nouns. The document also discusses the difference between the possessive pronoun "whose" and the contraction "who's". It provides exercises for readers to practice identifying possessive nouns and adjectives, as well as knowing when to use "whose" versus "who's".