Got them by the neck
Having taught ESL kids in a team teaching environment (with a Chinese teacher) in Hong Kong for two years, I've developed a trick, game, whatever for ensuring that kids speak English rather than Cantonese.
When I am speaking or working with a group of kids they must wear necklaces with a big E affixed on. (you could chose any symbol, letter, etc that you want) When kids have on their "English necklaces" they must speak in English. It works because the kids have a physical reminder to speak English. This can also be done with hats, wristbands etc.
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