AINT

Ain't is a negative inflection for am, is, are, has, and have in informal English. In some dialects, it is also used for do, does, did, and will. The development of ain't for the various forms of be, have, will and do occurred independently, at different times. The use of ain't for the forms of be was established by the mid-18th century and for the forms of have by the early 19th century.