must benefice
Regular verb: benefice - beneficed- beneficed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must benefice
you must benefice
she must benefice
we must benefice
you must benefice
they must benefice 	I must be beneficing
you must be beneficing
she must be beneficing
we must be beneficing
you must be beneficing
they must be beneficing	I must have beneficed
you must have beneficed
she 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
she 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
she 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
she 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
she 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
she 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 she benefice?
must we benefice?
must you benefice?
must they benefice? 	must I be beneficing?
must you be beneficing?
must she be beneficing?
must we be beneficing?
must you be beneficing?
must they be beneficing? 	must I have beneficed?
must you have beneficed?
must she 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 she 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 she 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 she 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 she 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 she have been beneficing?
mustn't we have been beneficing?
mustn't you have been beneficing?
mustn't they have been beneficing?