English verb conjugation
COULD REPRODUCE

Regular verb: reproduce - reproduced - reproduced

Affirmation

Simple form	V-ing form
I could reproduce you could reproduce she could reproduce we could reproduce you could reproduce they could reproduce	I could be reproducing you could be reproducing she could be reproducing we could be reproducing you could be reproducing they could be reproducing
Perfect	V-ing perfect
I could have reproduced you could have reproduced she could have reproduced we could have reproduced you could have reproduced they could have reproduced	I could have been reproducing you could have been reproducing she could have been reproducing we could have been reproducing you could have been reproducing they could have been reproducing

Negation

Simple form	V-ing form
I could not reproduce you could not reproduce she could not reproduce we could not reproduce you could not reproduce they could not reproduce	I could not be reproducing you could not be reproducing she could not be reproducing we could not be reproducing you could not be reproducing they could not be reproducing
Perfect	V-ing perfect
I could not have reproduced you could not have reproduced she could not have reproduced we could not have reproduced you could not have reproduced they could not have reproduced	I could not have been reproducing you could not have been reproducing she could not have been reproducing we could not have been reproducing you could not have been reproducing they could not have been reproducing

Interrogative form

Simple form	V-ing form
could I reproduce? could you reproduce? could she reproduce? could we reproduce? could you reproduce? could they reproduce?	could I be reproducing? could you be reproducing? could she be reproducing? could we be reproducing? could you be reproducing? could they be reproducing?
Perfect	V-ing perfect
could I have reproduced? could you have reproduced? could she have reproduced? could we have reproduced? could you have reproduced? could they have reproduced?	could I have been reproducing? could you have been reproducing? could she have been reproducing? could we have been reproducing? could you have been reproducing? could they have been reproducing?

Interro-negative form

Simple form	V-ing form
could I not reproduce? could you not reproduce? could she not reproduce? could we not reproduce? could you not reproduce? could they not reproduce?	could I not be reproducing? could you not be reproducing? could she not be reproducing? could we not be reproducing? could you not be reproducing? could they not be reproducing?
Perfect	V-ing perfect
could I not have reproduced? could you not have reproduced? could she not have reproduced? could we not have reproduced? could you not have reproduced? could they not have reproduced?	could I not have been reproducing? could you not have been reproducing? could she not have been reproducing? could we not have been reproducing? could you not have been reproducing? could they not have been reproducing?