must benefit
Regular verb: benefit - benefited- benefited

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must benefit
you must benefit
he must benefit
we must benefit
you must benefit
they must benefit 	I must be benefiting
you must be benefiting
he must be benefiting
we must be benefiting
you must be benefiting
they must be benefiting	I must have benefited
you must have benefited
he must have benefited
we must have benefited
you must have benefited
they must have benefited	I must have been benefiting
you must have been benefiting
he must have been benefiting
we must have been benefiting
you must have been benefiting
they must have been benefiting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't benefit
you mustn't benefit
he mustn't benefit
we mustn't benefit
you mustn't benefit
they mustn't benefit 	I mustn't be benefiting
you mustn't be benefiting
he mustn't be benefiting
we mustn't be benefiting
you mustn't be benefiting
they mustn't be benefiting	I mustn't have benefited
you mustn't have benefited
he mustn't have benefited
we mustn't have benefited
you mustn't have benefited
they mustn't have benefited	I mustn't have been benefiting
you mustn't have been benefiting
he mustn't have been benefiting
we mustn't have been benefiting
you mustn't have been benefiting
they mustn't have been benefiting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I benefit?
must you benefit?
must he benefit?
must we benefit?
must you benefit?
must they benefit? 	must I be benefiting?
must you be benefiting?
must he be benefiting?
must we be benefiting?
must you be benefiting?
must they be benefiting? 	must I have benefited?
must you have benefited?
must he have benefited?
must we have benefited?
must you have benefited?
must they have benefited? 	must I have been benefiting?
must you have been benefiting?
must he have been benefiting?
must we have been benefiting?
must you have been benefiting?
must they have been benefiting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I benefit?
mustn't you benefit?
mustn't he benefit?
mustn't we benefit?
mustn't you benefit?
mustn't they benefit? 	mustn't I be benefiting?
mustn't you be benefiting?
mustn't he be benefiting?
mustn't we be benefiting?
mustn't you be benefiting?
mustn't they be benefiting? 	mustn't I have benefited?
mustn't you have benefited?
mustn't he have benefited?
mustn't we have benefited?
mustn't you have benefited?
mustn't they have benefited? 	mustn't I have been benefiting?
mustn't you have been benefiting?
mustn't he have been benefiting?
mustn't we have been benefiting?
mustn't you have been benefiting?
mustn't they have been benefiting?