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