I could manage you could manage he could manage we could manage you could manage they could manage
Forma con V-ing
I could be managing you could be managing he could be managing we could be managing you could be managing they could be managing
Perfecto
I could have managed you could have managed he could have managed we could have managed you could have managed they could have managed
Perfecto con V-ing
I could have been managing you could have been managing he could have been managing we could have been managing you could have been managing they could have been managing
Negación
Forma simple
I could not manage you could not manage he could not manage we could not manage you could not manage they could not manage
Forma con V-ing
I could not be managing you could not be managing he could not be managing we could not be managing you could not be managing they could not be managing
Perfecto
I could not have managed you could not have managed he could not have managed we could not have managed you could not have managed they could not have managed
Perfecto con V-ing
I could not have been managing you could not have been managing he could not have been managing we could not have been managing you could not have been managing they could not have been managing
Forma interrogativa
Forma simple
could I manage? could you manage? could he manage? could we manage? could you manage? could they manage?
Forma con V-ing
could I be managing? could you be managing? could he be managing? could we be managing? could you be managing? could they be managing?
Perfecto
could I have managed? could you have managed? could he have managed? could we have managed? could you have managed? could they have managed?
Perfecto con V-ing
could I have been managing? could you have been managing? could he have been managing? could we have been managing? could you have been managing? could they have been managing?
Forma interro-negativa
Forma simple
could I not manage? could you not manage? could he not manage? could we not manage? could you not manage? could they not manage?
Forma con V-ing
could I not be managing? could you not be managing? could he not be managing? could we not be managing? could you not be managing? could they not be managing?
Perfecto
could I not have managed? could you not have managed? could he not have managed? could we not have managed? could you not have managed? could they not have managed?
Perfecto con V-ing
could I not have been managing? could you not have been managing? could he not have been managing? could we not have been managing? could you not have been managing? could they not have been managing?