English verb conjugation
COULD SCUFF

Regular verb: scuff - scuffed - scuffed

Affirmation

Simple form	V-ing form
I could scuff you could scuff she could scuff we could scuff you could scuff they could scuff	I could be scuffing you could be scuffing she could be scuffing we could be scuffing you could be scuffing they could be scuffing
Perfect	V-ing perfect
I could have scuffed you could have scuffed she could have scuffed we could have scuffed you could have scuffed they could have scuffed	I could have been scuffing you could have been scuffing she could have been scuffing we could have been scuffing you could have been scuffing they could have been scuffing

Negation

Simple form	V-ing form
I could not scuff you could not scuff she could not scuff we could not scuff you could not scuff they could not scuff	I could not be scuffing you could not be scuffing she could not be scuffing we could not be scuffing you could not be scuffing they could not be scuffing
Perfect	V-ing perfect
I could not have scuffed you could not have scuffed she could not have scuffed we could not have scuffed you could not have scuffed they could not have scuffed	I could not have been scuffing you could not have been scuffing she could not have been scuffing we could not have been scuffing you could not have been scuffing they could not have been scuffing

Interrogative form

Simple form	V-ing form
could I scuff? could you scuff? could she scuff? could we scuff? could you scuff? could they scuff?	could I be scuffing? could you be scuffing? could she be scuffing? could we be scuffing? could you be scuffing? could they be scuffing?
Perfect	V-ing perfect
could I have scuffed? could you have scuffed? could she have scuffed? could we have scuffed? could you have scuffed? could they have scuffed?	could I have been scuffing? could you have been scuffing? could she have been scuffing? could we have been scuffing? could you have been scuffing? could they have been scuffing?

Interro-negative form

Simple form	V-ing form
could I not scuff? could you not scuff? could she not scuff? could we not scuff? could you not scuff? could they not scuff?	could I not be scuffing? could you not be scuffing? could she not be scuffing? could we not be scuffing? could you not be scuffing? could they not be scuffing?
Perfect	V-ing perfect
could I not have scuffed? could you not have scuffed? could she not have scuffed? could we not have scuffed? could you not have scuffed? could they not have scuffed?	could I not have been scuffing? could you not have been scuffing? could she not have been scuffing? could we not have been scuffing? could you not have been scuffing? could they not have been scuffing?