The other day I was thinking about a particular social experiment you could try for your lessons in order to get the most natural sounding language. This would most likely be a Upper-Intermediate or Advanced lesson, it is kind of inspired from some linguistic studies I've heard about.
My idea was, get two of the teachers to sit in the recording room and chat about whatever. I know this is easier said than done, but if they are chatting for long enough, they will forget they are being recorded. From this, you could extract some significant parts (because the entire recording would be too long to use) and then analyse them. The start would obviously be kind of forced but if it is successful, by the end of the recording you might have some interesting language (especially natural sounding accents too).
This was just an idea I thought up, could make for some interesting lesson material.
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