I could coproduce you could coproduce he could coproduce we could coproduce you could coproduce they could coproduce
V-ing form
I could be coproducing you could be coproducing he could be coproducing we could be coproducing you could be coproducing they could be coproducing
Perfect
I could have coproduced you could have coproduced he could have coproduced we could have coproduced you could have coproduced they could have coproduced
V-ing perfect
I could have been coproducing you could have been coproducing he could have been coproducing we could have been coproducing you could have been coproducing they could have been coproducing
Negation
Simple form
I couldn't coproduce you couldn't coproduce he couldn't coproduce we couldn't coproduce you couldn't coproduce they couldn't coproduce
V-ing form
I couldn't be coproducing you couldn't be coproducing he couldn't be coproducing we couldn't be coproducing you couldn't be coproducing they couldn't be coproducing
Perfect
I couldn't have coproduced you couldn't have coproduced he couldn't have coproduced we couldn't have coproduced you couldn't have coproduced they couldn't have coproduced
V-ing perfect
I couldn't have been coproducing you couldn't have been coproducing he couldn't have been coproducing we couldn't have been coproducing you couldn't have been coproducing they couldn't have been coproducing
Interrogative form
Simple form
could I coproduce? could you coproduce? could he coproduce? could we coproduce? could you coproduce? could they coproduce?
V-ing form
could I be coproducing? could you be coproducing? could he be coproducing? could we be coproducing? could you be coproducing? could they be coproducing?
Perfect
could I have coproduced? could you have coproduced? could he have coproduced? could we have coproduced? could you have coproduced? could they have coproduced?
V-ing perfect
could I have been coproducing? could you have been coproducing? could he have been coproducing? could we have been coproducing? could you have been coproducing? could they have been coproducing?
Interro-negative form
Simple form
couldn't I coproduce? couldn't you coproduce? couldn't he coproduce? couldn't we coproduce? couldn't you coproduce? couldn't they coproduce?
V-ing form
couldn't I be coproducing? couldn't you be coproducing? couldn't he be coproducing? couldn't we be coproducing? couldn't you be coproducing? couldn't they be coproducing?
Perfect
couldn't I have coproduced? couldn't you have coproduced? couldn't he have coproduced? couldn't we have coproduced? couldn't you have coproduced? couldn't they have coproduced?
V-ing perfect
couldn't I have been coproducing? couldn't you have been coproducing? couldn't he have been coproducing? couldn't we have been coproducing? couldn't you have been coproducing? couldn't they have been coproducing?