Apostrophe Rules–A Quick Guide | Grammarly
www.grammarly.com › blog › apostropheMar 18, 2021 · The rules about forming possessives probably cause the most apostrophe confusion. They vary a little bit, depending on what type of noun you are making into a possessive. Here are the rules of thumb: For most singular nouns, add apostrophe+s: The dog’s leash The writer’s desk The planet’s atmosphere.