Since our school doesn't have an ESL program, I thought I would never need to know anything about the topic. Anyway, we have just been told that we are getting 50 Korean children aged 7-13 for the month of July. What we have been told is that they have been taught English in Korea, so we aren't starting from scratch.
Korean schools are very rigorous, formal, and heavy on teaching grammar.
What Korean students tend never to learn, however, is idiomatic conversational English, and that's what we're supposed to teach them. I'd like to try, but first I think we need some good basic ESL material.