could buffer
Verbo regular: buffer - buffered- buffered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could buffer
you could buffer
he could buffer
we could buffer
you could buffer
they could buffer 	I could be buffering
you could be buffering
he could be buffering
we could be buffering
you could be buffering
they could be buffering	I could have buffered
you could have buffered
he could have buffered
we could have buffered
you could have buffered
they could have buffered	I could have been buffering
you could have been buffering
he could have been buffering
we could have been buffering
you could have been buffering
they could have been buffering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't buffer
you couldn't buffer
he couldn't buffer
we couldn't buffer
you couldn't buffer
they couldn't buffer 	I couldn't be buffering
you couldn't be buffering
he couldn't be buffering
we couldn't be buffering
you couldn't be buffering
they couldn't be buffering	I couldn't have buffered
you couldn't have buffered
he couldn't have buffered
we couldn't have buffered
you couldn't have buffered
they couldn't have buffered	I couldn't have been buffering
you couldn't have been buffering
he couldn't have been buffering
we couldn't have been buffering
you couldn't have been buffering
they couldn't have been buffering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I buffer?
could you buffer?
could he buffer?
could we buffer?
could you buffer?
could they buffer? 	could I be buffering?
could you be buffering?
could he be buffering?
could we be buffering?
could you be buffering?
could they be buffering? 	could I have buffered?
could you have buffered?
could he have buffered?
could we have buffered?
could you have buffered?
could they have buffered? 	could I have been buffering?
could you have been buffering?
could he have been buffering?
could we have been buffering?
could you have been buffering?
could they have been buffering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I buffer?
couldn't you buffer?
couldn't he buffer?
couldn't we buffer?
couldn't you buffer?
couldn't they buffer? 	couldn't I be buffering?
couldn't you be buffering?
couldn't he be buffering?
couldn't we be buffering?
couldn't you be buffering?
couldn't they be buffering? 	couldn't I have buffered?
couldn't you have buffered?
couldn't he have buffered?
couldn't we have buffered?
couldn't you have buffered?
couldn't they have buffered? 	couldn't I have been buffering?
couldn't you have been buffering?
couldn't he have been buffering?
couldn't we have been buffering?
couldn't you have been buffering?
couldn't they have been buffering?