could ruff
Verbo regular: ruff - ruffed- ruffed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could ruff
you could ruff
he could ruff
we could ruff
you could ruff
they could ruff 	I could be ruffing
you could be ruffing
he could be ruffing
we could be ruffing
you could be ruffing
they could be ruffing	I could have ruffed
you could have ruffed
he could have ruffed
we could have ruffed
you could have ruffed
they could have ruffed	I could have been ruffing
you could have been ruffing
he could have been ruffing
we could have been ruffing
you could have been ruffing
they could have been ruffing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not ruff
you could not ruff
he could not ruff
we could not ruff
you could not ruff
they could not ruff 	I could not be ruffing
you could not be ruffing
he could not be ruffing
we could not be ruffing
you could not be ruffing
they could not be ruffing	I could not have ruffed
you could not have ruffed
he could not have ruffed
we could not have ruffed
you could not have ruffed
they could not have ruffed	I could not have been ruffing
you could not have been ruffing
he could not have been ruffing
we could not have been ruffing
you could not have been ruffing
they could not have been ruffing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I ruff?
could you ruff?
could he ruff?
could we ruff?
could you ruff?
could they ruff? 	could I be ruffing?
could you be ruffing?
could he be ruffing?
could we be ruffing?
could you be ruffing?
could they be ruffing? 	could I have ruffed?
could you have ruffed?
could he have ruffed?
could we have ruffed?
could you have ruffed?
could they have ruffed? 	could I have been ruffing?
could you have been ruffing?
could he have been ruffing?
could we have been ruffing?
could you have been ruffing?
could they have been ruffing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not ruff?
could you not ruff?
could he not ruff?
could we not ruff?
could you not ruff?
could they not ruff? 	could I not be ruffing?
could you not be ruffing?
could he not be ruffing?
could we not be ruffing?
could you not be ruffing?
could they not be ruffing? 	could I not have ruffed?
could you not have ruffed?
could he not have ruffed?
could we not have ruffed?
could you not have ruffed?
could they not have ruffed? 	could I not have been ruffing?
could you not have been ruffing?
could he not have been ruffing?
could we not have been ruffing?
could you not have been ruffing?
could they not have been ruffing?