***AIN’T  /eɪnt/ Show Spelled Pronunciation [eynt] Show IPA
1. Nonstandard except in some dialects. am not; are not; is not.
2. Nonstandard. have not; has not; do not; does not; did not.
***(TO BE) KEEN ON (SOMETHING/ DOING SOMETHING)
eager; interested; enthusiastic (often fol. by about, on, etc., or an infinitive): She is really keen on going swimming.