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