One thing i have enjoyed about teaching English are the differences between Formal English / Informal English. The grammar, tone, structure and vocabulary change depending on the context.
For example…
The store where I bought the shirt … Informal vs The store from which I bought the shirt. / Formal
I find this very interesting when trying to explain this to students and also trying to learn this from other languages like French or German.
I’m sure it is a challenge when teaching and learning as well.
Has anyone had any challenges while learning or teaching this in your language?
Any thoughts on the difference between English compared to other languages?

That’s an interesting question. I think in Spanish it is really difficult to manage “usted” (you formal) and you (informal). It all depends on the context and how others talk to you, so there is a rule, but not everybody follows it. Besides, we love to use a lot of different words to express something, and we just make it more complicate it for no reason. I think it can be as well our way not to be direct
. In the end, I think formal Spanish is more useful when one writes to someone in a higher position or an institution
.