welbeck
You do realise that there are literally millions of people who did not go to grammar school.
Should they be cast into outer darkness.
Or are they just beneath your cognisance.
It’s nothing to do with whether one went to Grammar School or not, but how well you were taught English at Primary and Secondary level.
There are other sorts of Secondary school, you know and grammar is not the sole preserve of the Grammar school!
My Scottish primary was very hot on grammar, spelling, parts of speech etc.
We did parsing along with weekly spelling tests and our teachers laid firm foundations for our future use of written and spoken English.