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