I could biff you could biff she could biff we could biff you could biff they could biff
Forma con V-ing
I could be biffing you could be biffing she could be biffing we could be biffing you could be biffing they could be biffing
Perfecto
I could have biffed you could have biffed she could have biffed we could have biffed you could have biffed they could have biffed
Perfecto con V-ing
I could have been biffing you could have been biffing she could have been biffing we could have been biffing you could have been biffing they could have been biffing
Negación
Forma simple
I could not biff you could not biff she could not biff we could not biff you could not biff they could not biff
Forma con V-ing
I could not be biffing you could not be biffing she could not be biffing we could not be biffing you could not be biffing they could not be biffing
Perfecto
I could not have biffed you could not have biffed she could not have biffed we could not have biffed you could not have biffed they could not have biffed
Perfecto con V-ing
I could not have been biffing you could not have been biffing she could not have been biffing we could not have been biffing you could not have been biffing they could not have been biffing
Forma interrogativa
Forma simple
could I biff? could you biff? could she biff? could we biff? could you biff? could they biff?
Forma con V-ing
could I be biffing? could you be biffing? could she be biffing? could we be biffing? could you be biffing? could they be biffing?
Perfecto
could I have biffed? could you have biffed? could she have biffed? could we have biffed? could you have biffed? could they have biffed?
Perfecto con V-ing
could I have been biffing? could you have been biffing? could she have been biffing? could we have been biffing? could you have been biffing? could they have been biffing?
Forma interro-negativa
Forma simple
could I not biff? could you not biff? could she not biff? could we not biff? could you not biff? could they not biff?
Forma con V-ing
could I not be biffing? could you not be biffing? could she not be biffing? could we not be biffing? could you not be biffing? could they not be biffing?
Perfecto
could I not have biffed? could you not have biffed? could she not have biffed? could we not have biffed? could you not have biffed? could they not have biffed?
Perfecto con V-ing
could I not have been biffing? could you not have been biffing? could she not have been biffing? could we not have been biffing? could you not have been biffing? could they not have been biffing?