must snap
Regular verb: snap - snapped- snapped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must snap
you must snap
she must snap
we must snap
you must snap
they must snap 	I must be snapping
you must be snapping
she must be snapping
we must be snapping
you must be snapping
they must be snapping	I must have snapped
you must have snapped
she must have snapped
we must have snapped
you must have snapped
they must have snapped	I must have been snapping
you must have been snapping
she must have been snapping
we must have been snapping
you must have been snapping
they must have been snapping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't snap
you mustn't snap
she mustn't snap
we mustn't snap
you mustn't snap
they mustn't snap 	I mustn't be snapping
you mustn't be snapping
she mustn't be snapping
we mustn't be snapping
you mustn't be snapping
they mustn't be snapping	I mustn't have snapped
you mustn't have snapped
she mustn't have snapped
we mustn't have snapped
you mustn't have snapped
they mustn't have snapped	I mustn't have been snapping
you mustn't have been snapping
she mustn't have been snapping
we mustn't have been snapping
you mustn't have been snapping
they mustn't have been snapping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I snap?
must you snap?
must she snap?
must we snap?
must you snap?
must they snap? 	must I be snapping?
must you be snapping?
must she be snapping?
must we be snapping?
must you be snapping?
must they be snapping? 	must I have snapped?
must you have snapped?
must she have snapped?
must we have snapped?
must you have snapped?
must they have snapped? 	must I have been snapping?
must you have been snapping?
must she have been snapping?
must we have been snapping?
must you have been snapping?
must they have been snapping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I snap?
mustn't you snap?
mustn't she snap?
mustn't we snap?
mustn't you snap?
mustn't they snap? 	mustn't I be snapping?
mustn't you be snapping?
mustn't she be snapping?
mustn't we be snapping?
mustn't you be snapping?
mustn't they be snapping? 	mustn't I have snapped?
mustn't you have snapped?
mustn't she have snapped?
mustn't we have snapped?
mustn't you have snapped?
mustn't they have snapped? 	mustn't I have been snapping?
mustn't you have been snapping?
mustn't she have been snapping?
mustn't we have been snapping?
mustn't you have been snapping?
mustn't they have been snapping?