As one of your study group, I'm sad to hear/read that you for one second you thought that your efforts were unappreciated. Not everyone on our list writes back, even if they do say (later, often, and in person) that they appreciate the input and conversation etc. In fact, I'm not even sure that *I* wrote back in appreciation! The in-class experience was gratifying, though, it seems. And it was very brave of you to get up there and do that (including facing the professor, who, while it makes sense that he was confused, could have been a little more effusive at first. I mean, c'mon? Your student *wrote a song* to illustrate one of the grammatical principles you barely taught us!)