Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could comment comment you could comment comment he could comment comment we could comment comment you could comment comment they could comment comment
V-ing form
I could be comment commenting you could be comment commenting he could be comment commenting we could be comment commenting you could be comment commenting they could be comment commenting
Perfect
I could have comment commented you could have comment commented he could have comment commented we could have comment commented you could have comment commented they could have comment commented
V-ing perfect
I could have been comment commenting you could have been comment commenting he could have been comment commenting we could have been comment commenting you could have been comment commenting they could have been comment commenting
Negation
Simple form
I could not comment comment you could not comment comment he could not comment comment we could not comment comment you could not comment comment they could not comment comment
V-ing form
I could not be comment commenting you could not be comment commenting he could not be comment commenting we could not be comment commenting you could not be comment commenting they could not be comment commenting
Perfect
I could not have comment commented you could not have comment commented he could not have comment commented we could not have comment commented you could not have comment commented they could not have comment commented
V-ing perfect
I could not have been comment commenting you could not have been comment commenting he could not have been comment commenting we could not have been comment commenting you could not have been comment commenting they could not have been comment commenting
Interrogative form
Simple form
could I comment comment? could you comment comment? could he comment comment? could we comment comment? could you comment comment? could they comment comment?
V-ing form
could I be comment commenting? could you be comment commenting? could he be comment commenting? could we be comment commenting? could you be comment commenting? could they be comment commenting?
Perfect
could I have comment commented? could you have comment commented? could he have comment commented? could we have comment commented? could you have comment commented? could they have comment commented?
V-ing perfect
could I have been comment commenting? could you have been comment commenting? could he have been comment commenting? could we have been comment commenting? could you have been comment commenting? could they have been comment commenting?
Interro-negative form
Simple form
could I not comment comment? could you not comment comment? could he not comment comment? could we not comment comment? could you not comment comment? could they not comment comment?
V-ing form
could I not be comment commenting? could you not be comment commenting? could he not be comment commenting? could we not be comment commenting? could you not be comment commenting? could they not be comment commenting?
Perfect
could I not have comment commented? could you not have comment commented? could he not have comment commented? could we not have comment commented? could you not have comment commented? could they not have comment commented?
V-ing perfect
could I not have been comment commenting? could you not have been comment commenting? could he not have been comment commenting? could we not have been comment commenting? could you not have been comment commenting? could they not have been comment commenting?