I can biff you can biff she can biff we can biff you can biff they can biff
Forma com V-ing
I can be biffing you can be biffing she can be biffing we can be biffing you can be biffing they can be biffing
Perfeito
I can have biffed you can have biffed she 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 she 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 she 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 she 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 she 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 she 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 she biff? can we biff? can you biff? can they biff?
Forma com V-ing
can I be biffing? can you be biffing? can she be biffing? can we be biffing? can you be biffing? can they be biffing?
Perfeito
can I have biffed? can you have biffed? can she 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 she 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 she 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 she 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 she 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 she have been biffing? can't we have been biffing? can't you have been biffing? can't they have been biffing?