I do not think English is a language (I sometimes make outrageous statements to prove a point).
A thousand years ago, people in England spoke Olde English, a German dialect. But Latin was used for property and law.Then they were invaded by the French. It was not until 1731 that French ceased to be used as the official legal language in England and dog Latin was used until 1871 in England. In the year 1492 Oxford University discovered the Greek language, the students them demonstrated their superior education by misusing Greek words in English sentences.
The Oxford dictionary has 171k words in it that are in use, another 47k words that are obsolete. A native adult English speaker may know only 20k-35k words, a small subset of the English language. Lower class may be more likely to say safety from the German. Upper class is more likely to say security from the French and Latin. Well educated middle class is more likely to use Latin- Greek-English pidgin that came from Oxford. College graduates are more likely to use terms of art they learned in their respective schools. If you listen carefully to their speech, you can tell if they are lower, middle, or upper class, the region they are from, and the subjects they studied in school. Fluent ESL (English as a Second Language) requires a vocabulary of only 3k words, which happen to be the set of words that most every English speaker actually knows. By comparison, you can read nearly every thing written in classical Latin with a vocabulary of less than 600 words.
Learning Latin grammar is the foundation for learning English grammar. You have to learn enough Greek to be able to read the footnotes in the Latin texts. Then you have to study German to be able to read Goethe in olde English. Then you need to be able to read French, at least for Proust. I think it was Voltaire who said, “I think in French, therefore I am!”
Once you have done that, you need to review the 3k ESL words, all of which likely fall into one of the four preceding categories so you already know them, and you are a fluent English speaker.