Change to the negative form. Use contractions where possible. We are brothers.
Today is Monday. ……………..
I am a good speaker. ……………
She is a good friend. ……………
They are busy today. ……………
Juan is busy today. …………….
We are busy today. …………..

We are brothers.  - We aren't brothers

Today is Monday.- Today isn't Monday.

I am a good speaker. - I am not a good speaker.

She is a good friend. - She isn;t a good friend.

They are busy today. - There aren't busy days.

Juan is busy today. - Juan isn't busy today.

We are busy today. - We aren't busy today.