"We are witnesses."
Translation:Nós somos testemunhas.
I'm sure native portuguese speakers know whether to use ser or estar without thought. But I have to make a decision each time, and sometimes I over-think it. In my mind you are a witness while you are in court, but it doesn't seem like a permanent feature of who I am, just an incidental thing at that moment. Thank you Paulenrique for helping me understand how ser makes more sense.