His and hers, yours and mine. How do we know whose is whose? It is all about possession. In this video, students are introduced to the apostrophe. We use an apostrophe and letter S to show belonging. Instead of saying "the skateboard belonging to Sue", we say "Sue's skateboard. We can also use possessive pronouns, like Sue's skateboard or HER skateboard. There are different possessive pronouns to describe different people or situations. That giant bar of chocolate is definitely mine.