Today I received the student evaluations from last semester - the moment of truth! They were a lot better than the fall ones, so I am not feeling too bad about myself. One comment, which I am sure was meant as a compliment, turned out very ambiguous. When writing about my strengths and weaknesses as an instructor a student wrote "She don't have any weakness", which actually points to my mistake of not spending enough time on grammar. Who would have thought, on the other hand, that a class of 25 native speakers would need a refresher on the usage of the -s ending in present tense third person singular? And plural.