Составить 3 отрицательных предложения и 3 дополнительных с глаголом to be!

I'm not writing now. She isn't cooking now. He isn't a teacher. I'm writing now. She's cooking now. He's a teacher.

l am not happythe book is not interestingHe is not our teacherl am not a doctorl am not in the roomthe book is not in the table