A. I am a doctor
r. I am not a doctor
B. We are the champios
r.We aren't the champions 
C. She is funny
r.She isn't funny
D. You are ugly
r. You aren't ugly
A: I am not a doctor. ou I'm not a doctor.
B. We are not the champions. ou We aren't the champions.
C. She is not funny. ou She isn't funny.
D. You are not ugly. ou You aren't ugly.