[AlienOverlord]

I teach in China to kindergarten aged kids and some classes really can get annoying, I think it depends on how good the Chinese teachers are mostly. Anyway, here's some things I do. Make students switch seats so they aren't sitting with their friends. Make students sit apart from the class. Have students sit near you. Take away students chairs and tell them to just stand.
If you can communicate with them in a meaningful way you have more options. I find my students like me and yours probably like you too so tell them you don't like it when they do whatever and they will probably make an effort not to do it. When you punish them tell them why they are being punished.
Try to be consistent in how you deal out punishment so they aren't left guessing what is acceptable and what isn't.