I am
Sum
You (s) are
Es
He/she/it is
Est
We are
Sumus
You (p) are
Estis
They are
Sunt
I will be
Erō
You (s) will be
Eris
He/she/it will be
Erit
We will be
Erimus
You (p) will be
Eritis
They will be
Erunt
I have been
Fuī
You (s) have been
Fuistī
He/she/it has been
Fuit
We have been
Fuimus
You (p) have been
Fuistis
They have been
Fuērunt