I am
Soy
You are
Eres
We are
Somos
You are(plural)
Sois
They are
Son
He/she is
Es
I was
Fui
She were
Fuiste
They were
Fueron
He was
Fue
I used to be
Era
You used to be
Eras
She used to be
Era
They used to be
Eran
I am being
Estoy siendo
He is being
Esta siendo
I am going to be
Voy a ser
She is going to be
Va a ser
They are going to be
Van a ser
I will be
Sere
He will be
Sera
I have been
He sido
He has been
Ha sido
They have been
Han sido