3. a.
1. isn't
2. isn't
3. aren't
4. isn't
5. aren't
6. isn't
7. am not
3.b.
She isn't makinh the bed
She is cooking dinner
They aren't sleeping at home
They are having lunch
She isn't playing with dolls
She is jumping on the trampoline
They aren't riding a bike
They are listening to the teacher
