could buff
Verbo regular: buff - buffed- buffed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could buff
you could buff
she could buff
we could buff
you could buff
they could buff 	I could be buffing
you could be buffing
she could be buffing
we could be buffing
you could be buffing
they could be buffing	I could have buffed
you could have buffed
she could have buffed
we could have buffed
you could have buffed
they could have buffed	I could have been buffing
you could have been buffing
she could have been buffing
we could have been buffing
you could have been buffing
they could have been buffing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't buff
you couldn't buff
she couldn't buff
we couldn't buff
you couldn't buff
they couldn't buff 	I couldn't be buffing
you couldn't be buffing
she couldn't be buffing
we couldn't be buffing
you couldn't be buffing
they couldn't be buffing	I couldn't have buffed
you couldn't have buffed
she couldn't have buffed
we couldn't have buffed
you couldn't have buffed
they couldn't have buffed	I couldn't have been buffing
you couldn't have been buffing
she couldn't have been buffing
we couldn't have been buffing
you couldn't have been buffing
they couldn't have been buffing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I buff?
could you buff?
could she buff?
could we buff?
could you buff?
could they buff? 	could I be buffing?
could you be buffing?
could she be buffing?
could we be buffing?
could you be buffing?
could they be buffing? 	could I have buffed?
could you have buffed?
could she have buffed?
could we have buffed?
could you have buffed?
could they have buffed? 	could I have been buffing?
could you have been buffing?
could she have been buffing?
could we have been buffing?
could you have been buffing?
could they have been buffing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I buff?
couldn't you buff?
couldn't she buff?
couldn't we buff?
couldn't you buff?
couldn't they buff? 	couldn't I be buffing?
couldn't you be buffing?
couldn't she be buffing?
couldn't we be buffing?
couldn't you be buffing?
couldn't they be buffing? 	couldn't I have buffed?
couldn't you have buffed?
couldn't she have buffed?
couldn't we have buffed?
couldn't you have buffed?
couldn't they have buffed? 	couldn't I have been buffing?
couldn't you have been buffing?
couldn't she have been buffing?
couldn't we have been buffing?
couldn't you have been buffing?
couldn't they have been buffing?