Today I was horrified to find that an adult student of nearly two years' standing could not tell me the definition of a rest!

Suggestions were "hang on to the note" (this is what she was doing), play quietly, pause (a bit nearer here!). The idea that it was a period of silence seemed quite alien! I am now quizzing others on the meaning of the rest signs. I think it is very easy to assume that a student knows something because they happen to be playing it correctly. However, she has at last understood how key signatures work, which is a concept she has so far found hard to grasp, so today has been quite a learning curve for her!