I can biff you can biff he can biff we can biff you can biff they can biff
Forma com V-ing
I can be biffing you can be biffing he can be biffing we can be biffing you can be biffing they can be biffing
Perfeito
I can have biffed you can have biffed he can have biffed we can have biffed you can have biffed they can have biffed
Perfeito com V-ing
I can have been biffing you can have been biffing he can have been biffing we can have been biffing you can have been biffing they can have been biffing
Negação
Forma simple
I can't biff you can't biff he can't biff we can't biff you can't biff they can't biff
Forma com V-ing
I can't be biffing you can't be biffing he can't be biffing we can't be biffing you can't be biffing they can't be biffing
Perfeito
I can't have biffed you can't have biffed he can't have biffed we can't have biffed you can't have biffed they can't have biffed
Perfeito com V-ing
I can't have been biffing you can't have been biffing he can't have been biffing we can't have been biffing you can't have been biffing they can't have been biffing
Forma interrogativa
Forma simple
can I biff? can you biff? can he biff? can we biff? can you biff? can they biff?
Forma com V-ing
can I be biffing? can you be biffing? can he be biffing? can we be biffing? can you be biffing? can they be biffing?
Perfeito
can I have biffed? can you have biffed? can he have biffed? can we have biffed? can you have biffed? can they have biffed?
Perfeito com V-ing
can I have been biffing? can you have been biffing? can he have been biffing? can we have been biffing? can you have been biffing? can they have been biffing?
Forma interro-Negação
Forma simple
can't I biff? can't you biff? can't he biff? can't we biff? can't you biff? can't they biff?
Forma com V-ing
can't I be biffing? can't you be biffing? can't he be biffing? can't we be biffing? can't you be biffing? can't they be biffing?
Perfeito
can't I have biffed? can't you have biffed? can't he have biffed? can't we have biffed? can't you have biffed? can't they have biffed?
Perfeito com V-ing
can't I have been biffing? can't you have been biffing? can't he have been biffing? can't we have been biffing? can't you have been biffing? can't they have been biffing?