English verb conjugation
CAN SCUFF

Regular verb: scuff - scuffed - scuffed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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