We _________ writing.
We aren't writing.
They (are not) cats.
They aren't cats.
They _________ cats.
They aren't cats.
You (are not) sad.
You aren't sad.
You __________ sad.
You aren't sad.
It (is not) juice.
It isn't juice.
It _________ juice.
It isn't juice.
He (is not) working.
He isn't working.
She __________ a dog.
She isn't a dog.
(I am not) a tree.
I'm not a tree.
