Verb to be complete

They ____________________ students .
He ____________________ a doctor .
Your brother ____________________ here .
We ____________________ at home , we are in the park .
I ____________________ at work .
She ____________________ sleeping .
We ____________________ on the bus .
The cats ____________________ playing .
I'm not at school , I ____________________ sick .
She ____________________ a nurse , she is a doctor .