Learning one language & teaching another
What if I'm learning Greek, but teaching English? I can't leave 'Greek' for my class, can I? :) What do I do then? Does anybody know?
How do you mean? Are you referring to the "classroom" feature of Duolingo.
The classroom feature is intended for actual schools so teachers can track the progress of their students on Duolingo and give them some assignments (lessons they need to complete or xp they need to gather).
Also keep in mind that if you join a classroom the person that set up the classroom can see your email address and is able to reset your password.