I don’t know when they quit teaching sentence diagramming. That and formal English grammar should still be taught, from elementary grades through high school.
“I don’t know when they quit teaching sentence diagramming. That and formal English grammar should still
be taught, from elementary grades through high school”.
You are correct that one who knows how to diagram sentences knows grammar at the highest level. Alas, probably no more more than a handful of teachers themselves today know how to diagram a sentence. To say it “should be tuaght” assumes there’s someone to teach it.