That was one of the great purposes for teaching Latin, back when good schools routinely had a Latin requirement. Lots of grammar. It was intended to carry over to English — and of course they taught English grammar too, back in the day. The ability to compare English grammar with Latin grammar helped on both topics.
But they largely dropped Latin. And they largely dropped English grammar. Spanish may be about the best chance a kid has to find out that languages actually have rules.
I took Latin I as a Freshman in 1954 while in Catholic School.
I didn’t grasp it as well as I should but Sister passed me as she knew I wasn’t going to be in CS the next year but she did make me ‘vow’ to never take Latin II. She needn’t have worried BUT surprisingly the New York State Regents System recognized it as my ‘language’ qual and when got moved to Cal for Senior year the question of a Language ‘major’ never came up.
It’s not only grammar and math that are being “deconstructed” in schools; it’s virtually every aspect of a good education.
When in elementary school, I recall that our principal at the beginning of each day played classical music over the loudspeaker. We became well acquainted with Brahms, Mozart, Beethoven, Tchaikovsky and Strauss. Every year students were invited to a concert by the city orchestra.
Each year in elementary school we would have a special theme/topic to explore, be it American history, agriculture or local business (oil business in Texas). This involved field trips, guest lectures, etc. Grades 5 and 6 got visiting lectures on art with explanations/critiques of the great paintings. The favorite was the week spent in a local camp with boating as well as farm visits and lectures under the stars on astronomy.