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 couldn't reproduce you couldn't reproduce she couldn't reproduce we couldn't reproduce you couldn't reproduce they couldn't reproduce	I couldn't be reproducing you couldn't be reproducing she couldn't be reproducing we couldn't be reproducing you couldn't be reproducing they couldn't be reproducing
Perfect	V-ing perfect
I couldn't have reproduced you couldn't have reproduced she couldn't have reproduced we couldn't have reproduced you couldn't have reproduced they couldn't have reproduced	I couldn't have been reproducing you couldn't have been reproducing she couldn't have been reproducing we couldn't have been reproducing you couldn't have been reproducing they couldn't 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
couldn't I reproduce? couldn't you reproduce? couldn't she reproduce? couldn't we reproduce? couldn't you reproduce? couldn't they reproduce?	couldn't I be reproducing? couldn't you be reproducing? couldn't she be reproducing? couldn't we be reproducing? couldn't you be reproducing? couldn't they be reproducing?
Perfect	V-ing perfect
couldn't I have reproduced? couldn't you have reproduced? couldn't she have reproduced? couldn't we have reproduced? couldn't you have reproduced? couldn't they have reproduced?	couldn't I have been reproducing? couldn't you have been reproducing? couldn't she have been reproducing? couldn't we have been reproducing? couldn't you have been reproducing? couldn't they have been reproducing?