could biff
Verbe régulier : biff - biffed- biffed
Traduction française : flanquer un coup de poing à 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could biff
you could biff
she could biff
we could biff
you could biff
they could biff 	I could be biffing
you could be biffing
she could be biffing
we could be biffing
you could be biffing
they could be biffing	I could have biffed
you could have biffed
she could have biffed
we could have biffed
you could have biffed
they could have biffed	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	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't biff
you couldn't biff
she couldn't biff
we couldn't biff
you couldn't biff
they couldn't biff 	I couldn't be biffing
you couldn't be biffing
she couldn't be biffing
we couldn't be biffing
you couldn't be biffing
they couldn't be biffing	I couldn't have biffed
you couldn't have biffed
she couldn't have biffed
we couldn't have biffed
you couldn't have biffed
they couldn't have biffed	I couldn't have been biffing
you couldn't have been biffing
she couldn't have been biffing
we couldn't have been biffing
you couldn't have been biffing
they couldn't have been biffing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I biff?
could you biff?
could she biff?
could we biff?
could you biff?
could they biff? 	could I be biffing?
could you be biffing?
could she be biffing?
could we be biffing?
could you be biffing?
could they be biffing? 	could I have biffed?
could you have biffed?
could she have biffed?
could we have biffed?
could you have biffed?
could they have biffed? 	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? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I biff?
couldn't you biff?
couldn't she biff?
couldn't we biff?
couldn't you biff?
couldn't they biff? 	couldn't I be biffing?
couldn't you be biffing?
couldn't she be biffing?
couldn't we be biffing?
couldn't you be biffing?
couldn't they be biffing? 	couldn't I have biffed?
couldn't you have biffed?
couldn't she have biffed?
couldn't we have biffed?
couldn't you have biffed?
couldn't they have biffed? 	couldn't I have been biffing?
couldn't you have been biffing?
couldn't she have been biffing?
couldn't we have been biffing?
couldn't you have been biffing?
couldn't they have been biffing?