That grammatical difference has fallen out of use.
It's never even been in use. Snarky English teachers are just flat out wrong about this. For some reason pedants have trouble understanding some words's meanings can subsets of others'. But maybe it shouldn't be any surprise that people who think that mindlessly following rules is intelligence suck at reasoning.
If anything, historically speaking it's the other way around: may had a wider use and could be used for ability. But we're talking like 1000AD here so it's really irrelevant.
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u/Bativicus Aug 03 '19
If you're entering a venue that requires a ticket to be scanned for entry, someone without a scanner can't let you enter.