I was - imperfect
era
you were - imperfect
eras
he was - imperfect
era
we were - imperfect
eramos
they were - imperfect
eran
i have been
he estado
you have been
has estado
he has been
ha estado
we have been
hemos estado
they have been (f)
han estado
I was (preterite)
fui
you were (preterite)
fuiste
he was (preterite)
fue
we were (preterite)
fuimos
they were (preterite)
fueron