Positive and negative forms

My name ____________________ Juan .
I am ____________________ a teacher .
She ____________________ fourteen years old .
We ____________________ students
I ____________________ not tired .
He ____________________ interested in soccer .
It ____________________ not a pencil .
You ____________________ good friends .
She ____________________ twelve years old .
You ____________________ engineers .
He ____________________ a doctor .
It ____________________ a ruler .
I ____________________ cold .
You ____________________ a teacher
They are ____________________ peruvians .
We ____________________ argentinians .