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 mustn't supper you mustn't supper he mustn't supper we mustn't supper you mustn't supper they mustn't supper
V-ing form
I mustn't be suppering you mustn't be suppering he mustn't be suppering we mustn't be suppering you mustn't be suppering they mustn't be suppering
Perfect
I mustn't have suppered you mustn't have suppered he mustn't have suppered we mustn't have suppered you mustn't have suppered they mustn't have suppered
V-ing perfect
I mustn't have been suppering you mustn't have been suppering he mustn't have been suppering we mustn't have been suppering you mustn't have been suppering they mustn't 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
mustn't I supper? mustn't you supper? mustn't he supper? mustn't we supper? mustn't you supper? mustn't they supper?
V-ing form
mustn't I be suppering? mustn't you be suppering? mustn't he be suppering? mustn't we be suppering? mustn't you be suppering? mustn't they be suppering?
Perfect
mustn't I have suppered? mustn't you have suppered? mustn't he have suppered? mustn't we have suppered? mustn't you have suppered? mustn't they have suppered?
V-ing perfect
mustn't I have been suppering? mustn't you have been suppering? mustn't he have been suppering? mustn't we have been suppering? mustn't you have been suppering? mustn't they have been suppering?