I am not an angel.
You are not a cleaner.
He is not a bad man.
She is not a cow. (is not/are not= isn't/aren't)
It is not right.
We are not leaving at this moment.
You are not going to the party.
They are not perfect.
I was not an angel.
you were not a cleaner.
she was not a cow.
it was not right. (was not / were not= was't/weren't)
we were not leaving at that moment.
You were not going to the party.
they were not perfect.