[AnonymousPlanet]

> On the other hand, I only learned (my native) English grammar by studying another language.

This is one of the reasons why Latin is tought. You learn transferring a gramatically hard language into your own, having to learn the ins and out of your own language's grammar. No grammatically complex situation in your own language can fluster you afterwards.

[eszed]

Agree. That's how / why students best learn grammar: for / through a practical purpose. (Deciding the practicality of Latin must remain an exercise for the reader.)