The greatest teacher I ever had was a middle-school english teacher who marked strictly on the basis of attendance and participation, never opened a textbook, enthusiastically read aloud from books of his students' choice as if he were performing them professionally on stage for half the class time, and spent the other half of the time just casually discussing the books with the students. The first words he said to the class on day one was "I don't want to hear the word preposition, and I don't think you do either."
It's a living, evolving, consensus language. It can't be nailed down to an algorithm. It's a language in which writers who break the rules become legendary. Would James Joyce or Charles Dodgson or the Bard himself have diagrammed a sentence? Heck no. They played with grammar and spelling the way a child plays with a pile of lego: with enthusiasm and imagination and a gleeful disregard for the instructions.
Not sure I would have ended up where I did but for their intervention.