must reprove
Regular verb: reprove - reproved- reproved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must reprove
you must reprove
he must reprove
we must reprove
you must reprove
they must reprove 	I must be reproving
you must be reproving
he must be reproving
we must be reproving
you must be reproving
they must be reproving	I must have reproved
you must have reproved
he must have reproved
we must have reproved
you must have reproved
they must have reproved	I must have been reproving
you must have been reproving
he must have been reproving
we must have been reproving
you must have been reproving
they must have been reproving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't reprove
you mustn't reprove
he mustn't reprove
we mustn't reprove
you mustn't reprove
they mustn't reprove 	I mustn't be reproving
you mustn't be reproving
he mustn't be reproving
we mustn't be reproving
you mustn't be reproving
they mustn't be reproving	I mustn't have reproved
you mustn't have reproved
he mustn't have reproved
we mustn't have reproved
you mustn't have reproved
they mustn't have reproved	I mustn't have been reproving
you mustn't have been reproving
he mustn't have been reproving
we mustn't have been reproving
you mustn't have been reproving
they mustn't have been reproving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I reprove?
must you reprove?
must he reprove?
must we reprove?
must you reprove?
must they reprove? 	must I be reproving?
must you be reproving?
must he be reproving?
must we be reproving?
must you be reproving?
must they be reproving? 	must I have reproved?
must you have reproved?
must he have reproved?
must we have reproved?
must you have reproved?
must they have reproved? 	must I have been reproving?
must you have been reproving?
must he have been reproving?
must we have been reproving?
must you have been reproving?
must they have been reproving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I reprove?
mustn't you reprove?
mustn't he reprove?
mustn't we reprove?
mustn't you reprove?
mustn't they reprove? 	mustn't I be reproving?
mustn't you be reproving?
mustn't he be reproving?
mustn't we be reproving?
mustn't you be reproving?
mustn't they be reproving? 	mustn't I have reproved?
mustn't you have reproved?
mustn't he have reproved?
mustn't we have reproved?
mustn't you have reproved?
mustn't they have reproved? 	mustn't I have been reproving?
mustn't you have been reproving?
mustn't he have been reproving?
mustn't we have been reproving?
mustn't you have been reproving?
mustn't they have been reproving?