i believe that it is not worth making a big deal about it. You just sit and dont get into a long and chatty type of conversation. You acknowledge he’s there, and answer the approprite questions if he asks, and then that’s it! Just do your own thing, and let him do his own thing. I would have thought that it may not be ok to do this, but there are teachers i know, and other people i respect, who would just sit and not make a scene out of it.
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