must benefice
Regular verb: benefice - beneficed- beneficed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must benefice
you must benefice
he must benefice
we must benefice
you must benefice
they must benefice 	I must be beneficing
you must be beneficing
he must be beneficing
we must be beneficing
you must be beneficing
they must be beneficing	I must have beneficed
you must have beneficed
he must have beneficed
we must have beneficed
you must have beneficed
they must have beneficed	I must have been beneficing
you must have been beneficing
he must have been beneficing
we must have been beneficing
you must have been beneficing
they must have been beneficing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't benefice
you mustn't benefice
he mustn't benefice
we mustn't benefice
you mustn't benefice
they mustn't benefice 	I mustn't be beneficing
you mustn't be beneficing
he mustn't be beneficing
we mustn't be beneficing
you mustn't be beneficing
they mustn't be beneficing	I mustn't have beneficed
you mustn't have beneficed
he mustn't have beneficed
we mustn't have beneficed
you mustn't have beneficed
they mustn't have beneficed	I mustn't have been beneficing
you mustn't have been beneficing
he mustn't have been beneficing
we mustn't have been beneficing
you mustn't have been beneficing
they mustn't have been beneficing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I benefice?
must you benefice?
must he benefice?
must we benefice?
must you benefice?
must they benefice? 	must I be beneficing?
must you be beneficing?
must he be beneficing?
must we be beneficing?
must you be beneficing?
must they be beneficing? 	must I have beneficed?
must you have beneficed?
must he have beneficed?
must we have beneficed?
must you have beneficed?
must they have beneficed? 	must I have been beneficing?
must you have been beneficing?
must he have been beneficing?
must we have been beneficing?
must you have been beneficing?
must they have been beneficing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I benefice?
mustn't you benefice?
mustn't he benefice?
mustn't we benefice?
mustn't you benefice?
mustn't they benefice? 	mustn't I be beneficing?
mustn't you be beneficing?
mustn't he be beneficing?
mustn't we be beneficing?
mustn't you be beneficing?
mustn't they be beneficing? 	mustn't I have beneficed?
mustn't you have beneficed?
mustn't he have beneficed?
mustn't we have beneficed?
mustn't you have beneficed?
mustn't they have beneficed? 	mustn't I have been beneficing?
mustn't you have been beneficing?
mustn't he have been beneficing?
mustn't we have been beneficing?
mustn't you have been beneficing?
mustn't they have been beneficing?