a. She is not (isn't) a young girl.
b. I am not a detective.
c. They are not (aren't) ugly cats.
d. We are not (aren't) strong girls.
e. Steven is not (isn't) from England.
f. You are not (aren't) a nurse.
g. He is not (isn't) a basketball player.
h. They are not (aren't) bottles.
i. That is not (isn't) a fish.
j. The black cat is not (isn't) small.
k. The boy is not (isn't) lazy.