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