English verb conjugation
MUST SCUFF

Regular verb: scuff - scuffed - scuffed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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