English verb conjugation
CAN ROLF

Regular verb: rolf - rolfed - rolfed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
I can't rolf you can't rolf he can't rolf we can't rolf you can't rolf they can't rolf	I can't be rolfing you can't be rolfing he can't be rolfing we can't be rolfing you can't be rolfing they can't be rolfing
Perfect	V-ing perfect
I can't have rolfed you can't have rolfed he can't have rolfed we can't have rolfed you can't have rolfed they can't have rolfed	I can't have been rolfing you can't have been rolfing he can't have been rolfing we can't have been rolfing you can't have been rolfing they can't have been rolfing

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
can't I rolf? can't you rolf? can't he rolf? can't we rolf? can't you rolf? can't they rolf?	can't I be rolfing? can't you be rolfing? can't he be rolfing? can't we be rolfing? can't you be rolfing? can't they be rolfing?
Perfect	V-ing perfect
can't I have rolfed? can't you have rolfed? can't he have rolfed? can't we have rolfed? can't you have rolfed? can't they have rolfed?	can't I have been rolfing? can't you have been rolfing? can't he have been rolfing? can't we have been rolfing? can't you have been rolfing? can't they have been rolfing?