There may also be a question of style (formal/conversational). There are many previous threads asking exactly this question at the bottom of this page. 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 Postalisch hinein #17, When referring to a long course of lessons, do we use lesson instead of class? And many https://seitensprung23174.eedblog.com/33864590/untersuchen-sie-diesen-bericht-über-chill