English verb conjugation
COULD SCUFF

Regular verb: scuff - scuffed - scuffed

Affirmation

Simple form	V-ing form
I could scuff you could scuff he could scuff we could scuff you could scuff they could scuff	I could be scuffing you could be scuffing he 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 he 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 he 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 couldn't scuff you couldn't scuff he couldn't scuff we couldn't scuff you couldn't scuff they couldn't scuff	I couldn't be scuffing you couldn't be scuffing he couldn't be scuffing we couldn't be scuffing you couldn't be scuffing they couldn't be scuffing
Perfect	V-ing perfect
I couldn't have scuffed you couldn't have scuffed he couldn't have scuffed we couldn't have scuffed you couldn't have scuffed they couldn't have scuffed	I couldn't have been scuffing you couldn't have been scuffing he couldn't have been scuffing we couldn't have been scuffing you couldn't have been scuffing they couldn't have been scuffing

Interrogative form

Simple form	V-ing form
could I scuff? could you scuff? could he scuff? could we scuff? could you scuff? could they scuff?	could I be scuffing? could you be scuffing? could he 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 he 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 he 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
couldn't I scuff? couldn't you scuff? couldn't he scuff? couldn't we scuff? couldn't you scuff? couldn't they scuff?	couldn't I be scuffing? couldn't you be scuffing? couldn't he be scuffing? couldn't we be scuffing? couldn't you be scuffing? couldn't they be scuffing?
Perfect	V-ing perfect
couldn't I have scuffed? couldn't you have scuffed? couldn't he have scuffed? couldn't we have scuffed? couldn't you have scuffed? couldn't they have scuffed?	couldn't I have been scuffing? couldn't you have been scuffing? couldn't he have been scuffing? couldn't we have been scuffing? couldn't you have been scuffing? couldn't they have been scuffing?