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 must not underproduce
you must not underproduce
he must not underproduce
we must not underproduce
you must not underproduce
they must not underproduce 	I must not be underproducing
you must not be underproducing
he must not be underproducing
we must not be underproducing
you must not be underproducing
they must not be underproducing	I must not have underproduced
you must not have underproduced
he must not have underproduced
we must not have underproduced
you must not have underproduced
they must not have underproduced	I must not have been underproducing
you must not have been underproducing
he must not have been underproducing
we must not have been underproducing
you must not have been underproducing
they must not 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 	
must I not underproduce?
must you not underproduce?
must he not underproduce?
must we not underproduce?
must you not underproduce?
must they not underproduce? 	must I not be underproducing?
must you not be underproducing?
must he not be underproducing?
must we not be underproducing?
must you not be underproducing?
must they not be underproducing? 	must I not have underproduced?
must you not have underproduced?
must he not have underproduced?
must we not have underproduced?
must you not have underproduced?
must they not have underproduced? 	must I not have been underproducing?
must you not have been underproducing?
must he not have been underproducing?
must we not have been underproducing?
must you not have been underproducing?
must they not have been underproducing?