I could gain you could gain he could gain we could gain you could gain they could gain
Forma con V-ing
I could be gaining you could be gaining he could be gaining we could be gaining you could be gaining they could be gaining
Perfecto
I could have gained you could have gained he could have gained we could have gained you could have gained they could have gained
Perfecto con V-ing
I could have been gaining you could have been gaining he could have been gaining we could have been gaining you could have been gaining they could have been gaining
Negación
Forma simple
I could not gain you could not gain he could not gain we could not gain you could not gain they could not gain
Forma con V-ing
I could not be gaining you could not be gaining he could not be gaining we could not be gaining you could not be gaining they could not be gaining
Perfecto
I could not have gained you could not have gained he could not have gained we could not have gained you could not have gained they could not have gained
Perfecto con V-ing
I could not have been gaining you could not have been gaining he could not have been gaining we could not have been gaining you could not have been gaining they could not have been gaining
Forma interrogativa
Forma simple
could I gain? could you gain? could he gain? could we gain? could you gain? could they gain?
Forma con V-ing
could I be gaining? could you be gaining? could he be gaining? could we be gaining? could you be gaining? could they be gaining?
Perfecto
could I have gained? could you have gained? could he have gained? could we have gained? could you have gained? could they have gained?
Perfecto con V-ing
could I have been gaining? could you have been gaining? could he have been gaining? could we have been gaining? could you have been gaining? could they have been gaining?
Forma interro-negativa
Forma simple
could I not gain? could you not gain? could he not gain? could we not gain? could you not gain? could they not gain?
Forma con V-ing
could I not be gaining? could you not be gaining? could he not be gaining? could we not be gaining? could you not be gaining? could they not be gaining?
Perfecto
could I not have gained? could you not have gained? could he not have gained? could we not have gained? could you not have gained? could they not have gained?
Perfecto con V-ing
could I not have been gaining? could you not have been gaining? could he not have been gaining? could we not have been gaining? could you not have been gaining? could they not have been gaining?