What is ain't supposed to be short for?
Isn't is not
Ain't ? Not
https://www.merriam-webster.com/dictionary/ain't
shareOh, yes, has not as well. I forgot about that one lol.
shareAre not, am not, have not and is not. It's not a real contraction. It's a slang word.
shareI am aware that ain't is a slang word, but ai should be short for something am, are, is doesn't fit.
shareBecause, again, it isn't a real contraction.
share"Is" is also a slang / creole for "am" and "are." Just like in the song "Is You is or is You ain't My Baby." It makes sense from the prespective of people whose first language isn't English (or similar.)
shareIt's is a completely acceptable contraction. Its is a possessive pronoun.
share"Ain't" is the incorrect way of saying "Isn't." It was a term made up by uneducated morons way back in the day, and is unfortunately sometimes still used.
shareAint... Huh! What is it short for? Absolutely nothing!
shareI'd say am not more than the others. But am-n't doesn't look right and saying I aren't isn't correct either, so ain't works better phonetically. Sometimes words aren't about grammar, but about sound.
Imma get back to you with an answer when I find out.
share