my friends are...not the brightest (i) 's on the ceiling and they say "i aint gots to"
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Etymology: contraction of are not
1 : am not : are not : is not
2 : have not : has not
3 : do not : does not : did not -- used in some varieties of Black English
Usage: Although widely disapproved as nonstandard and more common in the habitual speech of the less educated, 'ain't' in senses 1 and 2 is flourishing in American English. It is used in both speech and writing to catch attention and to gain emphasis . It is used especially in journalistic prose as part of a consistently informal style . This informal ain't is commonly distinguished from habitual ain't by its frequent occurrence in fixed constructions and phrases
Ain't is a contraction originally for "am not", but now typically meaning "is not", "am not", or "are not". The word is a perennial problem in English usage.
It is considered by prescriptivists to be a shibboleth; as with i'n'it, its frequent use is said to be a marker of basilectal – which is to say, lower class – speech. This judgement, hard to justify on etymological or grammatical reasons, remains a widespread belief, and is to some extent self-perpetuating, since both teachers and educated parents discourage the use of the term.
Ain't arose toward the end of an eighteenth century period that marked the development of most of the English contracted verb forms such as can't, don't, and won't. The form first appears in print in 1778. It was preceded by an't, which had been common for about a century previously. An't appears first in print in the work of Restoration playwrights: it is seen first in 1695, when William Congreve wrote I can hear you farther off, I an't deaf, suggesting that the form was in the beginning a contraction of "am not". But as early as 1696 Sir John Vanbrugh uses the form for "are not": These shoes an't ugly, but they don't fit me. At least in some dialects, an't is likely to have been pronounced like ain't, and thus the appearance of ain't is more a clarified spelling than a new verb form; in some dialects of British English, are rhymed with air, and a 1791 American spelling reformer proposed spelling "are" as er. Ain't in these earliest uses seems to have served as a contraction for both am not and are not.
During the nineteenth century, with the rise of prescriptivist usage writers, ain't fell under attack. The attack came on two fronts: usage writers did not know or pretended not to know what ain't was a contraction of, and its use was condemned as a vulgarism – here meaning a part of the speech of the lower classes. Perhaps partly as a reaction to this trend, the number of situations in which ain't was used began to expand: some speakers began to use ain't in place of is not, have not, and has not.
Ain't would solve one logical problem of English grammar; it would serve as a useful contracted inverted form in the question Ain't I? Many prescriptivists prefer Aren't I in this situation; this is illogical in conjugation (the Hiberno-English form Amn't I? follows other patterns), and for speakers of non-rhotic dialects may only be a baroque spelling of one possible pronunciation of the eighteenth century an't. Ain't is also obligatory in some fixed phrases, such as Say it ain't so. Ain't may also be mandatory if you accept African-American vernacular English as an alternative set of grammatical norms. However, most usage writers continue to condemn "ain't".
Bon Jovi sang "Say it isn't so"
1706, originally a contraction of am not, and in proper use with that sense until it began to be used as a generic contraction for are not, is not, etc., in early 19c. Cockney dialect of London, popularized by representations of this in Dickens, etc., which led to the word being banished from correct English.