could proffer
Verbo regular: proffer - proffered- proffered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could proffer
you could proffer
he could proffer
we could proffer
you could proffer
they could proffer 	I could be proffering
you could be proffering
he could be proffering
we could be proffering
you could be proffering
they could be proffering	I could have proffered
you could have proffered
he could have proffered
we could have proffered
you could have proffered
they could have proffered	I could have been proffering
you could have been proffering
he could have been proffering
we could have been proffering
you could have been proffering
they could have been proffering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not proffer
you could not proffer
he could not proffer
we could not proffer
you could not proffer
they could not proffer 	I could not be proffering
you could not be proffering
he could not be proffering
we could not be proffering
you could not be proffering
they could not be proffering	I could not have proffered
you could not have proffered
he could not have proffered
we could not have proffered
you could not have proffered
they could not have proffered	I could not have been proffering
you could not have been proffering
he could not have been proffering
we could not have been proffering
you could not have been proffering
they could not have been proffering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I proffer?
could you proffer?
could he proffer?
could we proffer?
could you proffer?
could they proffer? 	could I be proffering?
could you be proffering?
could he be proffering?
could we be proffering?
could you be proffering?
could they be proffering? 	could I have proffered?
could you have proffered?
could he have proffered?
could we have proffered?
could you have proffered?
could they have proffered? 	could I have been proffering?
could you have been proffering?
could he have been proffering?
could we have been proffering?
could you have been proffering?
could they have been proffering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not proffer?
could you not proffer?
could he not proffer?
could we not proffer?
could you not proffer?
could they not proffer? 	could I not be proffering?
could you not be proffering?
could he not be proffering?
could we not be proffering?
could you not be proffering?
could they not be proffering? 	could I not have proffered?
could you not have proffered?
could he not have proffered?
could we not have proffered?
could you not have proffered?
could they not have proffered? 	could I not have been proffering?
could you not have been proffering?
could he not have been proffering?
could we not have been proffering?
could you not have been proffering?
could they not have been proffering?