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