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