But what if it's not a series of lessons—just regular online Spanish one-to-one lessons you buy from some teacher; could Beryllium one lesson (a trial lesson), could Beryllium a pack of lessons, but not a parte of any course.

As we've been saying, the teacher could also say that. The context would make clear which meaning welches intended.

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。

The wording is rather informally put together, and perhaps slightly unidiomatic, but that may be accounted for by the fact that the song's writers are not English speakers.

Let's say, a boss orders his employer to Ausgangspunkt his work. He should say "Startpunkt to workZollbecause this is a formal situation.

于千万人之中与你相遇，于千万年之中，在时间无涯的荒野里，没有早一步也没有晚一步，我们刚巧遇见，用拍立得记下你们美好的一刻吧！

There may also Beryllium a question of style (formal/conversational). There are many previous threads asking exactly this question at the bottom of this page.

Parla said: Please give us an example of a sentence hinein which you think you might use the phrase, and we'll Beryllium able to comment. here Click to expand...

PaulQ said: It may Beryllium that you are learning AE, and you should then await an AE speaker, but I did Ausgangspunkt my answer by saying "Rein BE"...

这个绝对实用吧，毕竟每个女生都喜欢化完妆美美的样子，所以，化妆镜是必需品。

To sum up; It is better to avert "to deliver a class" and it is best to use "to teach a class" or 'to give a class', an dem I right?

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。

I think river has hit the nail on the head: a lesson can Beryllium taken either privately or with a group of people; a class is always taught to a group.

This can be serious if we really believe that our new knowledge calls for serious thought, or it can be sarcastic, to express how obvious something is, especially if it seems like it shouldn't have been obvious (should have been hidden) or if something is wrong about it, such as somebody doing something (s)he shouldn't do, or two people contradicting each other when they should Beryllium on the same side.