could rolf
Verbo regular: rolf - rolfed- rolfed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could rolf
you could rolf
he could rolf
we could rolf
you could rolf
they could rolf 	I could be rolfing
you could be rolfing
he could be rolfing
we could be rolfing
you could be rolfing
they could be rolfing	I could have rolfed
you could have rolfed
he could have rolfed
we could have rolfed
you could have rolfed
they could have rolfed	I could have been rolfing
you could have been rolfing
he could have been rolfing
we could have been rolfing
you could have been rolfing
they could have been rolfing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not rolf
you could not rolf
he could not rolf
we could not rolf
you could not rolf
they could not rolf 	I could not be rolfing
you could not be rolfing
he could not be rolfing
we could not be rolfing
you could not be rolfing
they could not be rolfing	I could not have rolfed
you could not have rolfed
he could not have rolfed
we could not have rolfed
you could not have rolfed
they could not have rolfed	I could not have been rolfing
you could not have been rolfing
he could not have been rolfing
we could not have been rolfing
you could not have been rolfing
they could not have been rolfing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I rolf?
could you rolf?
could he rolf?
could we rolf?
could you rolf?
could they rolf? 	could I be rolfing?
could you be rolfing?
could he be rolfing?
could we be rolfing?
could you be rolfing?
could they be rolfing? 	could I have rolfed?
could you have rolfed?
could he have rolfed?
could we have rolfed?
could you have rolfed?
could they have rolfed? 	could I have been rolfing?
could you have been rolfing?
could he have been rolfing?
could we have been rolfing?
could you have been rolfing?
could they have been rolfing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not rolf?
could you not rolf?
could he not rolf?
could we not rolf?
could you not rolf?
could they not rolf? 	could I not be rolfing?
could you not be rolfing?
could he not be rolfing?
could we not be rolfing?
could you not be rolfing?
could they not be rolfing? 	could I not have rolfed?
could you not have rolfed?
could he not have rolfed?
could we not have rolfed?
could you not have rolfed?
could they not have rolfed? 	could I not have been rolfing?
could you not have been rolfing?
could he not have been rolfing?
could we not have been rolfing?
could you not have been rolfing?
could they not have been rolfing?