When should you teach the Possessive Nouns lesson? Possessive nouns help identify ownership — that something belongs to someone or something else. This lesson teaches students how to use an apostrophe followed by an s (‘s) for people, time words and without a noun. It also enables understanding of how to add an apostrophe after a plural noun that ends in -s, or names that end in -s. The lesson is suitable for elementary level students and can be taught to children, teenagers and adults. Our ESL lesson library also includes lessons on nouns and articles that will help prepare students for this material. We recommend three lessons — Subject Pronouns (N1.1), Object Pronouns (N2.1) and The Basic Use of the Verb to be (VS1.1) — as pre-requisites.