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