With all due respect for your efforts here nona, but do you really think it's a good idea that you teach people English? I mean, it's like with my French and German, I can help with some simple things but I definitely shouldn't teach people stuff, because I'll make mistakes for sure. In the same way, I don't think it's really beneficial for anyone if you teach people, with all due respect again, sloppy English.

Anyway, by all means do whatever you want to do, just remember that it's harder to correct people afterwards than to learn people something properly from the start.