POSSESSIVESThere is a formula for making possessives. It's not a guessing game. If a noun is singular (one thing), you add an 's to make it possessive....EVEN IF IT ENDS WITH AN S. Examples: The dog has a bone.....The dog's bone. The girl has a bow....The girl's bow. Chris has a shirt....Chris's shirt. If it's plural (more than one) and already ends with an s, just add an apostrophe. Examples: All the girls have a locker room....The girls' locker room. The boys have a soccer game.......The boys' soccer game. If it's plural and doesn't end with an s (children, men, women), add 's. Examples: The children have a playground....The children's playground. The men have a club...The men's club. The women have a party....The women's party. A girl's night out is not going to be very social. A girls' night out, however, sounds like fun.