What gets me as a non-native speaker far more than "a vs an" is the "a vs the" conundrum. I still don't quite get when something needs to be "indefinite" and I've been speaking English for close to forty years. My native tongue lacks articles altogether and it's soo bloody hard I feel hopeless I'll ever master them fully.
That rule isn’t universal though. “I go to the dentist every year” doesn’t imply that I particularly care about a specific dentist (or, case in point, about the specific dentist).
“This was a nice evening” is also difficult to characterize as not caring about which evening it is. As are books titled “An Introduction to XYZ”, where both the authors and the readers will probably care about the specific book.
"I go to the dentist every year" implies that you have a usual dentist or some sort of stable routine or plan vs "I go on a trip every year" which implies the journey is yet to be selected/defined from a multitude of options.
So I feel the rule isn't always taken literally, but the vs a is selected based on whether something is up for consideration/substitution rather than something that's well defined and specified.
abraxas · · focus · HN ↗
AndrewDucker · · focus · HN ↗
"Pass me a plate" - any plate will do. "Pass me the plate" - I want the specific plate which we were talking about.
layer8 · · focus · HN ↗
“This was a nice evening” is also difficult to characterize as not caring about which evening it is. As are books titled “An Introduction to XYZ”, where both the authors and the readers will probably care about the specific book.
zdc1 · · focus · HN ↗
So I feel the rule isn't always taken literally, but the vs a is selected based on whether something is up for consideration/substitution rather than something that's well defined and specified.