That's life unfortunately. As a dated BE speaker I would not use class, I would use lesson. May be it's the standard Schwierigkeit 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。 In both the UK and the US, a class is usually a group of students https://sexkontakte25692.educationalimpactblog.com/55489245/wenig-bekannte-fakten-über-chillout