Place an empty chair in the middle of the room and then discuss how one good way to avoid gossiping is to imagine the person who you are talking about is sitting in that chair. Are you telling the truth? Is it kind? Is it necessary to tell? Do you have that person's permission to tell this story or news? Would you really say these things if the person were sitting in the chair? If you can't answer yes to all of these questions, then you are probably gossipping and should talk about something else.