I've been learning Spanish for a while now and it's been a great time, save for a time when my profesora was replaced by a native. The new profesora was a really nice lady, I guess, and a teacher with an impressive potential for development; the thing was, however, we had no proper coursebook and relied on her materials... and I had no idea what was going on in the class, what new skills I developed, what things I was supposed to learn. I tried talking to her DoS, but soon I got frustrated and eventually I quit.