can rolf
Verbo regular: rolf - rolfed- rolfed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can rolf
you can rolf
he can rolf
we can rolf
you can rolf
they can rolf 	I can be rolfing
you can be rolfing
he can be rolfing
we can be rolfing
you can be rolfing
they can be rolfing	I can have rolfed
you can have rolfed
he can have rolfed
we can have rolfed
you can have rolfed
they can have rolfed	I can have been rolfing
you can have been rolfing
he can have been rolfing
we can have been rolfing
you can have been rolfing
they can have been rolfing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot rolf
you cannot rolf
he cannot rolf
we cannot rolf
you cannot rolf
they cannot rolf 	I cannot be rolfing
you cannot be rolfing
he cannot be rolfing
we cannot be rolfing
you cannot be rolfing
they cannot be rolfing	I cannot have rolfed
you cannot have rolfed
he cannot have rolfed
we cannot have rolfed
you cannot have rolfed
they cannot have rolfed	I cannot have been rolfing
you cannot have been rolfing
he cannot have been rolfing
we cannot have been rolfing
you cannot have been rolfing
they cannot have been rolfing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I rolf?
can you rolf?
can he rolf?
can we rolf?
can you rolf?
can they rolf? 	can I be rolfing?
can you be rolfing?
can he be rolfing?
can we be rolfing?
can you be rolfing?
can they be rolfing? 	can I have rolfed?
can you have rolfed?
can he have rolfed?
can we have rolfed?
can you have rolfed?
can they have rolfed? 	can I have been rolfing?
can you have been rolfing?
can he have been rolfing?
can we have been rolfing?
can you have been rolfing?
can they have been rolfing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not rolf?
can you not rolf?
can he not rolf?
can we not rolf?
can you not rolf?
can they not rolf? 	can I not be rolfing?
can you not be rolfing?
can he not be rolfing?
can we not be rolfing?
can you not be rolfing?
can they not be rolfing? 	can I not have rolfed?
can you not have rolfed?
can he not have rolfed?
can we not have rolfed?
can you not have rolfed?
can they not have rolfed? 	can I not have been rolfing?
can you not have been rolfing?
can he not have been rolfing?
can we not have been rolfing?
can you not have been rolfing?
can they not have been rolfing?