These days I'm getting a lot of second thoughts about the whole English only rule. The reason for this is that now that I am in a team teaching situation I welcome much of the input I get from my Korean co teacher this is really useful when it comes to discipline, or explaining how to play a new game.

Sure the whole English only thing works in theory but I have some classes with 45-50 students. Not that I want to make a return to Grammar translation syndrome i think that you need to make the transition gradual

The one obvious danger you have with the English only rule is that you might have some students who are just parroting you. In other words they may be repeating without understanding.