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