Conjugación del verbo inglés
CAN BIFF

Verbo regular: biff - biffed - biffed

Afirmación

Forma simple	Forma con V-ing
I can biff you can biff he can biff we can biff you can biff they can biff	I can be biffing you can be biffing he can be biffing we can be biffing you can be biffing they can be biffing
Perfecto	Perfecto con V-ing
I can have biffed you can have biffed he can have biffed we can have biffed you can have biffed they can have biffed	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

Negación

Forma simple	Forma con V-ing
I can't biff you can't biff he can't biff we can't biff you can't biff they can't biff	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
Perfecto	Perfecto con V-ing
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	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	Forma con V-ing
can I biff? can you biff? can he biff? can we biff? can you biff? can they biff?	can I be biffing? can you be biffing? can he be biffing? can we be biffing? can you be biffing? can they be biffing?
Perfecto	Perfecto con V-ing
can I have biffed? can you have biffed? can he have biffed? can we have biffed? can you have biffed? can they have biffed?	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-negativa

Forma simple	Forma con V-ing
can't I biff? can't you biff? can't he biff? can't we biff? can't you biff? can't they biff?	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?
Perfecto	Perfecto con V-ing
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?	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?