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