English verb conjugation
COULD UNDERPRODUCE

Regular verb: underproduce - underproduced - underproduced

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?