[crisholm]

Well, kick them out of both courses - obviously the higher one is too difficult for them and they are a nuisance in the lower one. Or let them take the Dialang test to find their level ; some work with descriptors would help.
Anyway, I don't know why I got into this discussion - I guess I got chatty , happy about being back on the site.
I am a great fan of your site, Clive. Wonderful work! Very useful for us busy teachers and very enjoyable for our students. Congratulations!
P.S. Perhaps they are in love with their teacher!