must snivel
Regular verb: snivel - snivelled- snivelled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must snivel
you must snivel
he must snivel
we must snivel
you must snivel
they must snivel 	I must be snivelling
you must be snivelling
he must be snivelling
we must be snivelling
you must be snivelling
they must be snivelling	I must have snivelled
you must have snivelled
he must have snivelled
we must have snivelled
you must have snivelled
they must have snivelled	I must have been snivelling
you must have been snivelling
he must have been snivelling
we must have been snivelling
you must have been snivelling
they must have been snivelling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't snivel
you mustn't snivel
he mustn't snivel
we mustn't snivel
you mustn't snivel
they mustn't snivel 	I mustn't be snivelling
you mustn't be snivelling
he mustn't be snivelling
we mustn't be snivelling
you mustn't be snivelling
they mustn't be snivelling	I mustn't have snivelled
you mustn't have snivelled
he mustn't have snivelled
we mustn't have snivelled
you mustn't have snivelled
they mustn't have snivelled	I mustn't have been snivelling
you mustn't have been snivelling
he mustn't have been snivelling
we mustn't have been snivelling
you mustn't have been snivelling
they mustn't have been snivelling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I snivel?
must you snivel?
must he snivel?
must we snivel?
must you snivel?
must they snivel? 	must I be snivelling?
must you be snivelling?
must he be snivelling?
must we be snivelling?
must you be snivelling?
must they be snivelling? 	must I have snivelled?
must you have snivelled?
must he have snivelled?
must we have snivelled?
must you have snivelled?
must they have snivelled? 	must I have been snivelling?
must you have been snivelling?
must he have been snivelling?
must we have been snivelling?
must you have been snivelling?
must they have been snivelling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I snivel?
mustn't you snivel?
mustn't he snivel?
mustn't we snivel?
mustn't you snivel?
mustn't they snivel? 	mustn't I be snivelling?
mustn't you be snivelling?
mustn't he be snivelling?
mustn't we be snivelling?
mustn't you be snivelling?
mustn't they be snivelling? 	mustn't I have snivelled?
mustn't you have snivelled?
mustn't he have snivelled?
mustn't we have snivelled?
mustn't you have snivelled?
mustn't they have snivelled? 	mustn't I have been snivelling?
mustn't you have been snivelling?
mustn't he have been snivelling?
mustn't we have been snivelling?
mustn't you have been snivelling?
mustn't they have been snivelling?