aren't
Concise Oxford English Dictionary © 2008 Oxford University Press:
aren't/ɑːnt/
▶contraction
- 1 are not.
- 2 am not (only used in questions).
usage: Aren't is used to mean ‘am not’ in questions, as in I'm right, aren't I? Outside questions, aren't used to mean ‘am not’ (e.g. I aren't going) is wrong.
'aren't' also found in these Oxford entries:

