Thank you very much for your comments!

There are hundreds of different prepositions in English. Specifically making a lesson from ”on”, ”at” and ”in” was a natural thing to do because these three are among the most common prepositions in English, often are confused with each other even within English, frequently do not directly translate into English from many languages and are sometimes used differently in British and American English, leading to confusion for language learners.

Another lesson would require some thought - which prepositions out of hundreds to focus on? I could write a huge book on prepositions if I had the time

Also, I would probably need pictures to help describe most prepositions in a way that most language learners could easily understand.

Before doing any of that, I would prefer to write a lesson on the metaphorical uses of ”in”, ”on” or ”at”. For example, why do we have the expression ”to say something *in* English” and not ”why do we say something *on* English”, like in many other languages?

Yes those are prepositions.there are some more such as,under,infront of,behind,beside,etc.if there are few examples your article is good.

I’ve just translated the lesson in all languages (drop down menu at the top of the page). It can still be corrected by the site users if there are some mistakes from the automatic translation

Aussie, please leave a comment here when you think this article is complete enough, it will allow me to start the translation in all languages (first automatically and then thanks to the polyglotclub members)