English verb conjugation
CAN ROLF

Regular verb: rolf - rolfed - rolfed

Affirmation

Simple form	V-ing form
I can rolf you can rolf she can rolf we can rolf you can rolf they can rolf	I can be rolfing you can be rolfing she can be rolfing we can be rolfing you can be rolfing they can be rolfing
Perfect	V-ing perfect
I can have rolfed you can have rolfed she 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 she can have been rolfing we can have been rolfing you can have been rolfing they can have been rolfing

Negation

Simple form	V-ing form
I cannot rolf you cannot rolf she cannot rolf we cannot rolf you cannot rolf they cannot rolf	I cannot be rolfing you cannot be rolfing she cannot be rolfing we cannot be rolfing you cannot be rolfing they cannot be rolfing
Perfect	V-ing perfect
I cannot have rolfed you cannot have rolfed she 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 she cannot have been rolfing we cannot have been rolfing you cannot have been rolfing they cannot have been rolfing

Interrogative form

Simple form	V-ing form
can I rolf? can you rolf? can she rolf? can we rolf? can you rolf? can they rolf?	can I be rolfing? can you be rolfing? can she be rolfing? can we be rolfing? can you be rolfing? can they be rolfing?
Perfect	V-ing perfect
can I have rolfed? can you have rolfed? can she 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 she have been rolfing? can we have been rolfing? can you have been rolfing? can they have been rolfing?

Interro-negative form

Simple form	V-ing form
can I not rolf? can you not rolf? can she 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 she not be rolfing? can we not be rolfing? can you not be rolfing? can they not be rolfing?
Perfect	V-ing perfect
can I not have rolfed? can you not have rolfed? can she 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 she not have been rolfing? can we not have been rolfing? can you not have been rolfing? can they not have been rolfing?