I am
Soy
I was
Fui
I used to be
era
I will be there around 10
seré allí a las diez
I have been
He sido
I can
(Can I ?)
puedo
I was able to
Pude
I used to be able to
Podía
I will be able to
Podré
I have been able to
He podido
I do
Hago
I did
Hice
I used to do
Hacia
I will do
Haré
I have done
He hecho
I go
voy
I went
fui
I used to go
iba
I will go
iré
I have gone
he ido
are you going
Vas a ir
I have
tengo
I had
tuve
I used to have
tenia