must snuff
Regular verb: snuff - snuffed- snuffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must snuff
you must snuff
he must snuff
we must snuff
you must snuff
they must snuff 	I must be snuffing
you must be snuffing
he must be snuffing
we must be snuffing
you must be snuffing
they must be snuffing	I must have snuffed
you must have snuffed
he must have snuffed
we must have snuffed
you must have snuffed
they must have snuffed	I must have been snuffing
you must have been snuffing
he must have been snuffing
we must have been snuffing
you must have been snuffing
they must have been snuffing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't snuff
you mustn't snuff
he mustn't snuff
we mustn't snuff
you mustn't snuff
they mustn't snuff 	I mustn't be snuffing
you mustn't be snuffing
he mustn't be snuffing
we mustn't be snuffing
you mustn't be snuffing
they mustn't be snuffing	I mustn't have snuffed
you mustn't have snuffed
he mustn't have snuffed
we mustn't have snuffed
you mustn't have snuffed
they mustn't have snuffed	I mustn't have been snuffing
you mustn't have been snuffing
he mustn't have been snuffing
we mustn't have been snuffing
you mustn't have been snuffing
they mustn't have been snuffing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I snuff?
must you snuff?
must he snuff?
must we snuff?
must you snuff?
must they snuff? 	must I be snuffing?
must you be snuffing?
must he be snuffing?
must we be snuffing?
must you be snuffing?
must they be snuffing? 	must I have snuffed?
must you have snuffed?
must he have snuffed?
must we have snuffed?
must you have snuffed?
must they have snuffed? 	must I have been snuffing?
must you have been snuffing?
must he have been snuffing?
must we have been snuffing?
must you have been snuffing?
must they have been snuffing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I snuff?
mustn't you snuff?
mustn't he snuff?
mustn't we snuff?
mustn't you snuff?
mustn't they snuff? 	mustn't I be snuffing?
mustn't you be snuffing?
mustn't he be snuffing?
mustn't we be snuffing?
mustn't you be snuffing?
mustn't they be snuffing? 	mustn't I have snuffed?
mustn't you have snuffed?
mustn't he have snuffed?
mustn't we have snuffed?
mustn't you have snuffed?
mustn't they have snuffed? 	mustn't I have been snuffing?
mustn't you have been snuffing?
mustn't he have been snuffing?
mustn't we have been snuffing?
mustn't you have been snuffing?
mustn't they have been snuffing?