could coproduce
Regular verb: coproduce - coproduced- coproduced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could coproduce
you could coproduce
she could coproduce
we could coproduce
you could coproduce
they could coproduce 	I could be coproducing
you could be coproducing
she could be coproducing
we could be coproducing
you could be coproducing
they could be coproducing	I could have coproduced
you could have coproduced
she could have coproduced
we could have coproduced
you could have coproduced
they could have coproduced	I could have been coproducing
you could have been coproducing
she could have been coproducing
we could have been coproducing
you could have been coproducing
they could have been coproducing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not coproduce
you could not coproduce
she could not coproduce
we could not coproduce
you could not coproduce
they could not coproduce 	I could not be coproducing
you could not be coproducing
she could not be coproducing
we could not be coproducing
you could not be coproducing
they could not be coproducing	I could not have coproduced
you could not have coproduced
she could not have coproduced
we could not have coproduced
you could not have coproduced
they could not have coproduced	I could not have been coproducing
you could not have been coproducing
she could not have been coproducing
we could not have been coproducing
you could not have been coproducing
they could not have been coproducing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I coproduce?
could you coproduce?
could she coproduce?
could we coproduce?
could you coproduce?
could they coproduce? 	could I be coproducing?
could you be coproducing?
could she be coproducing?
could we be coproducing?
could you be coproducing?
could they be coproducing? 	could I have coproduced?
could you have coproduced?
could she have coproduced?
could we have coproduced?
could you have coproduced?
could they have coproduced? 	could I have been coproducing?
could you have been coproducing?
could she have been coproducing?
could we have been coproducing?
could you have been coproducing?
could they have been coproducing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not coproduce?
could you not coproduce?
could she not coproduce?
could we not coproduce?
could you not coproduce?
could they not coproduce? 	could I not be coproducing?
could you not be coproducing?
could she not be coproducing?
could we not be coproducing?
could you not be coproducing?
could they not be coproducing? 	could I not have coproduced?
could you not have coproduced?
could she not have coproduced?
could we not have coproduced?
could you not have coproduced?
could they not have coproduced? 	could I not have been coproducing?
could you not have been coproducing?
could she not have been coproducing?
could we not have been coproducing?
could you not have been coproducing?
could they not have been coproducing?