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