This document discusses the use of possessive 's in English. It explains that possessive 's is used for family relations and possession. There are two ways to show possession in English: use 's with people and animals, or use the preposition "of" for things. It provides examples like "the boy's ball" and "the legs of the table". It also discusses forming the possessive case for plural nouns ending in s, like "the girls' house" or "my parents' car". The document concludes with examples practicing the use of possessive 's in different contexts.