That's life unfortunately. As a dated Beryllium speaker I would not use class, I would use lesson. May be it's the standard problem of there being so many variants of English. 知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 Regarding exgerman's post in #17, When referring to a long course of lessons, do we https://kylerrnbqd.blogoscience.com/40009962/wenig-bekannte-fakten-über-mix