Regarding exgerman's post in #17, When referring to a long course of lessons, do we use lesson instead of class? Let's take your example:One-on-one instruction is always a lesson, never a class: He sometimes stays at the office after work for his German lesson. After the lesson he goes home. https://youtu.be/T0zWXvhEQwo?si=wNc6ihu97ShtIl7u