B E L I E V E
Teach your students to think POSITIVELY everyday. Even to start each day with having a student(s) tell one positive thing that happened to them the previous day. Perhaps writing a positive quote or thought on the board each day and using it as a handwriting assignment. Also, asking the students what the quote and/or thought means to them. Making positive comments throughout the day always speaking from that side so as not to pick on the negative. The dynamics and the spirit of the class will pick up on that and hopefully the students will start talking and acting in the same manner.