I could go you could go he could go we could go you could go they could go
Forma con V-ing
I could be going you could be going he could be going we could be going you could be going they could be going
Perfecto
I could have gone you could have gone he could have gone we could have gone you could have gone they could have gone
Perfecto con V-ing
I could have been going you could have been going he could have been going we could have been going you could have been going they could have been going
Negación
Forma simple
I could not go you could not go he could not go we could not go you could not go they could not go
Forma con V-ing
I could not be going you could not be going he could not be going we could not be going you could not be going they could not be going
Perfecto
I could not have gone you could not have gone he could not have gone we could not have gone you could not have gone they could not have gone
Perfecto con V-ing
I could not have been going you could not have been going he could not have been going we could not have been going you could not have been going they could not have been going
Forma interrogativa
Forma simple
could I go? could you go? could he go? could we go? could you go? could they go?
Forma con V-ing
could I be going? could you be going? could he be going? could we be going? could you be going? could they be going?
Perfecto
could I have gone? could you have gone? could he have gone? could we have gone? could you have gone? could they have gone?
Perfecto con V-ing
could I have been going? could you have been going? could he have been going? could we have been going? could you have been going? could they have been going?
Forma interro-negativa
Forma simple
could I not go? could you not go? could he not go? could we not go? could you not go? could they not go?
Forma con V-ing
could I not be going? could you not be going? could he not be going? could we not be going? could you not be going? could they not be going?
Perfecto
could I not have gone? could you not have gone? could he not have gone? could we not have gone? could you not have gone? could they not have gone?
Perfecto con V-ing
could I not have been going? could you not have been going? could he not have been going? could we not have been going? could you not have been going? could they not have been going?