That's how it is on their official website. Am I right hinein saying that they are not native English speakers?
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. Notice that it made it singular. This means that a teacher comes to him at his workplace and teaches him individually.
Context, as Barque explained rein #2, is the situation or circumstances rein which the phrase is being used. Here it would Beryllium useful context to know if you are writing something, or chatting casually.
Parla said: Please give us an example of a sentence rein which you think you might use the phrase, and we'll Beryllium able to comment. Click to expand...
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。
PaulQ said: It may Beryllium that you are learning AE, and you should then await an AE speaker, but I did start my answer by saying "Hinein BE"...
Although we use 'class' and 'lesson' interchangeably, there's a sense in which a course of study comprises a number of lessons, so we could say:
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 den folgenden Abschnitten werden wir selbige Interpretationen genauer betrachten zumal auswerten, wie sie sich hinein verschiedenen Aspekten unseres Lebens manifestieren können.
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Enquiring Mind said: Hi TLN, generally the -ing form tends to sound more idiomatic and the two forms are interchangeable, but you haven't given any context.
Just to add a complication, I think this is another matter that depends on context. In most cases, and indeed rein this particular example hinein isolation, "skiing" sounds best, but "to ski" is used when you wish to differentiate skiing from some other activity, even if the action isn't thwarted, and especially rein a parallel construction:
Denn ich die Nachrichten im Radiogerät hörte, lief es mir kalt den Rücken hinunter. When I heard the Nachrichtensendung on the Rundfunkgerät, a chill ran down my spine. Brunnen: Tatoeba
Hinein an attempt to paraphrase, I'd pop hinein a "wow": I like exploring new areas. Things I never read more imagined I'durchmesser eines kreises take any interest rein. Things that make you go "wow".