English verb conjugation
COULD ROLF

Regular verb: rolf - rolfed - rolfed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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