must prescribe
Regular verb: prescribe - prescribed- prescribed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must prescribe
you must prescribe
he must prescribe
we must prescribe
you must prescribe
they must prescribe 	I must be prescribing
you must be prescribing
he must be prescribing
we must be prescribing
you must be prescribing
they must be prescribing	I must have prescribed
you must have prescribed
he must have prescribed
we must have prescribed
you must have prescribed
they must have prescribed	I must have been prescribing
you must have been prescribing
he must have been prescribing
we must have been prescribing
you must have been prescribing
they must have been prescribing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't prescribe
you mustn't prescribe
he mustn't prescribe
we mustn't prescribe
you mustn't prescribe
they mustn't prescribe 	I mustn't be prescribing
you mustn't be prescribing
he mustn't be prescribing
we mustn't be prescribing
you mustn't be prescribing
they mustn't be prescribing	I mustn't have prescribed
you mustn't have prescribed
he mustn't have prescribed
we mustn't have prescribed
you mustn't have prescribed
they mustn't have prescribed	I mustn't have been prescribing
you mustn't have been prescribing
he mustn't have been prescribing
we mustn't have been prescribing
you mustn't have been prescribing
they mustn't have been prescribing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I prescribe?
must you prescribe?
must he prescribe?
must we prescribe?
must you prescribe?
must they prescribe? 	must I be prescribing?
must you be prescribing?
must he be prescribing?
must we be prescribing?
must you be prescribing?
must they be prescribing? 	must I have prescribed?
must you have prescribed?
must he have prescribed?
must we have prescribed?
must you have prescribed?
must they have prescribed? 	must I have been prescribing?
must you have been prescribing?
must he have been prescribing?
must we have been prescribing?
must you have been prescribing?
must they have been prescribing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I prescribe?
mustn't you prescribe?
mustn't he prescribe?
mustn't we prescribe?
mustn't you prescribe?
mustn't they prescribe? 	mustn't I be prescribing?
mustn't you be prescribing?
mustn't he be prescribing?
mustn't we be prescribing?
mustn't you be prescribing?
mustn't they be prescribing? 	mustn't I have prescribed?
mustn't you have prescribed?
mustn't he have prescribed?
mustn't we have prescribed?
mustn't you have prescribed?
mustn't they have prescribed? 	mustn't I have been prescribing?
mustn't you have been prescribing?
mustn't he have been prescribing?
mustn't we have been prescribing?
mustn't you have been prescribing?
mustn't they have been prescribing?