must underproduce
Regular verb: underproduce - underproduced- underproduced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must underproduce
you must underproduce
he must underproduce
we must underproduce
you must underproduce
they must underproduce 	I must be underproducing
you must be underproducing
he must be underproducing
we must be underproducing
you must be underproducing
they must be underproducing	I must have underproduced
you must have underproduced
he must have underproduced
we must have underproduced
you must have underproduced
they must have underproduced	I must have been underproducing
you must have been underproducing
he must have been underproducing
we must have been underproducing
you must have been underproducing
they must have been underproducing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't underproduce
you mustn't underproduce
he mustn't underproduce
we mustn't underproduce
you mustn't underproduce
they mustn't underproduce 	I mustn't be underproducing
you mustn't be underproducing
he mustn't be underproducing
we mustn't be underproducing
you mustn't be underproducing
they mustn't be underproducing	I mustn't have underproduced
you mustn't have underproduced
he mustn't have underproduced
we mustn't have underproduced
you mustn't have underproduced
they mustn't have underproduced	I mustn't have been underproducing
you mustn't have been underproducing
he mustn't have been underproducing
we mustn't have been underproducing
you mustn't have been underproducing
they mustn't have been underproducing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I underproduce?
must you underproduce?
must he underproduce?
must we underproduce?
must you underproduce?
must they underproduce? 	must I be underproducing?
must you be underproducing?
must he be underproducing?
must we be underproducing?
must you be underproducing?
must they be underproducing? 	must I have underproduced?
must you have underproduced?
must he have underproduced?
must we have underproduced?
must you have underproduced?
must they have underproduced? 	must I have been underproducing?
must you have been underproducing?
must he have been underproducing?
must we have been underproducing?
must you have been underproducing?
must they have been underproducing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I underproduce?
mustn't you underproduce?
mustn't he underproduce?
mustn't we underproduce?
mustn't you underproduce?
mustn't they underproduce? 	mustn't I be underproducing?
mustn't you be underproducing?
mustn't he be underproducing?
mustn't we be underproducing?
mustn't you be underproducing?
mustn't they be underproducing? 	mustn't I have underproduced?
mustn't you have underproduced?
mustn't he have underproduced?
mustn't we have underproduced?
mustn't you have underproduced?
mustn't they have underproduced? 	mustn't I have been underproducing?
mustn't you have been underproducing?
mustn't he have been underproducing?
mustn't we have been underproducing?
mustn't you have been underproducing?
mustn't they have been underproducing?