must vault
Regular verb: vault - vaulted- vaulted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must vault
you must vault
he must vault
we must vault
you must vault
they must vault 	I must be vaulting
you must be vaulting
he must be vaulting
we must be vaulting
you must be vaulting
they must be vaulting	I must have vaulted
you must have vaulted
he must have vaulted
we must have vaulted
you must have vaulted
they must have vaulted	I must have been vaulting
you must have been vaulting
he must have been vaulting
we must have been vaulting
you must have been vaulting
they must have been vaulting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't vault
you mustn't vault
he mustn't vault
we mustn't vault
you mustn't vault
they mustn't vault 	I mustn't be vaulting
you mustn't be vaulting
he mustn't be vaulting
we mustn't be vaulting
you mustn't be vaulting
they mustn't be vaulting	I mustn't have vaulted
you mustn't have vaulted
he mustn't have vaulted
we mustn't have vaulted
you mustn't have vaulted
they mustn't have vaulted	I mustn't have been vaulting
you mustn't have been vaulting
he mustn't have been vaulting
we mustn't have been vaulting
you mustn't have been vaulting
they mustn't have been vaulting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I vault?
must you vault?
must he vault?
must we vault?
must you vault?
must they vault? 	must I be vaulting?
must you be vaulting?
must he be vaulting?
must we be vaulting?
must you be vaulting?
must they be vaulting? 	must I have vaulted?
must you have vaulted?
must he have vaulted?
must we have vaulted?
must you have vaulted?
must they have vaulted? 	must I have been vaulting?
must you have been vaulting?
must he have been vaulting?
must we have been vaulting?
must you have been vaulting?
must they have been vaulting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I vault?
mustn't you vault?
mustn't he vault?
mustn't we vault?
mustn't you vault?
mustn't they vault? 	mustn't I be vaulting?
mustn't you be vaulting?
mustn't he be vaulting?
mustn't we be vaulting?
mustn't you be vaulting?
mustn't they be vaulting? 	mustn't I have vaulted?
mustn't you have vaulted?
mustn't he have vaulted?
mustn't we have vaulted?
mustn't you have vaulted?
mustn't they have vaulted? 	mustn't I have been vaulting?
mustn't you have been vaulting?
mustn't he have been vaulting?
mustn't we have been vaulting?
mustn't you have been vaulting?
mustn't they have been vaulting?