could underproduce
Regular verb: underproduce - underproduced- underproduced

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

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

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

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