must scuff
Regular verb: scuff - scuffed- scuffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
I mustn't scuff
you mustn't scuff
she mustn't scuff
we mustn't scuff
you mustn't scuff
they mustn't scuff 	I mustn't be scuffing
you mustn't be scuffing
she mustn't be scuffing
we mustn't be scuffing
you mustn't be scuffing
they mustn't be scuffing	I mustn't have scuffed
you mustn't have scuffed
she mustn't have scuffed
we mustn't have scuffed
you mustn't have scuffed
they mustn't have scuffed	I mustn't have been scuffing
you mustn't have been scuffing
she mustn't have been scuffing
we mustn't have been scuffing
you mustn't have been scuffing
they mustn't have been scuffing	

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