I could fox you could fox she could fox we could fox you could fox they could fox
Forma con V-ing
I could be foxing you could be foxing she could be foxing we could be foxing you could be foxing they could be foxing
Perfecto
I could have foxed you could have foxed she could have foxed we could have foxed you could have foxed they could have foxed
Perfecto con V-ing
I could have been foxing you could have been foxing she could have been foxing we could have been foxing you could have been foxing they could have been foxing
Negación
Forma simple
I could not fox you could not fox she could not fox we could not fox you could not fox they could not fox
Forma con V-ing
I could not be foxing you could not be foxing she could not be foxing we could not be foxing you could not be foxing they could not be foxing
Perfecto
I could not have foxed you could not have foxed she could not have foxed we could not have foxed you could not have foxed they could not have foxed
Perfecto con V-ing
I could not have been foxing you could not have been foxing she could not have been foxing we could not have been foxing you could not have been foxing they could not have been foxing
Forma interrogativa
Forma simple
could I fox? could you fox? could she fox? could we fox? could you fox? could they fox?
Forma con V-ing
could I be foxing? could you be foxing? could she be foxing? could we be foxing? could you be foxing? could they be foxing?
Perfecto
could I have foxed? could you have foxed? could she have foxed? could we have foxed? could you have foxed? could they have foxed?
Perfecto con V-ing
could I have been foxing? could you have been foxing? could she have been foxing? could we have been foxing? could you have been foxing? could they have been foxing?
Forma interro-negativa
Forma simple
could I not fox? could you not fox? could she not fox? could we not fox? could you not fox? could they not fox?
Forma con V-ing
could I not be foxing? could you not be foxing? could she not be foxing? could we not be foxing? could you not be foxing? could they not be foxing?
Perfecto
could I not have foxed? could you not have foxed? could she not have foxed? could we not have foxed? could you not have foxed? could they not have foxed?
Perfecto con V-ing
could I not have been foxing? could you not have been foxing? could she not have been foxing? could we not have been foxing? could you not have been foxing? could they not have been foxing?