a
or
the
John:
Can you guess what I bought my mother for her birthday?
Mary:
I've no idea. What?
John:
dog!
Mary:
Are you crazy? She hates dogs.
John:
Well, she's going to love
one I bought her.
Mary:
So what makes you think
dog you bought is so special?
John:
Well it's got
really cute tail.
Mary:
You are
complete idiot! No one cares about that.
John:
Well, my mother is going to be
person looking after it, so don't worry about it.
Mary:
I just feel sorry for your mother, having
fool for a son.