- Nonstandard except in some dialects. am not; are not; is not.
- Nonstandard. have not; has not; do not; does not; did not.
- am not, is not, are not, have not, or has notI ain’t seen it
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.