turn into negative [use the long forms:]his cap is little.The ballons are in the air.I am her new friend.This is your notebook.They are at school.I am the first child.Andrew is a good student.My friends are in the classroom.
His cap is not little. The ballons are not in the air. I am not her new friend. This is not your notebook. They are not at school. I am not the first child. Andrew is not a good student. My friends are not in the classroom.