English verb conjugation
COULD UNDERPRODUCE

Regular verb: underproduce - underproduced - underproduced

Affirmation

Simple form	V-ing form
I could underproduce you could underproduce she could underproduce we could underproduce you could underproduce they could underproduce	I could be underproducing you could be underproducing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she underproduce? could we underproduce? could you underproduce? could they underproduce?	could I be underproducing? could you be underproducing? could she 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 she 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 she 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 she 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 she 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 she 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 she have been underproducing? couldn't we have been underproducing? couldn't you have been underproducing? couldn't they have been underproducing?