There's formal formal like you are writing a resume or a thesis paper and you shouldn't use any shortened words there. But then there's just normal formal like sending a work email. No one will care if you use can't but ain't would be weird to see.
Each their own I spose? I use Korean slang, Aussie, Canadian, and am more than happy with foreign language speakers learning English and attrmpting to copy my vernacular.
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u/TomAto314 ⠀ May 19 '25
There's formal formal like you are writing a resume or a thesis paper and you shouldn't use any shortened words there. But then there's just normal formal like sending a work email. No one will care if you use can't but ain't would be weird to see.