I'd be enthusiasming you'd be enthusiasming he'd be enthusiasming we'd be enthusiasming you'd be enthusiasming they'd be enthusiasming
Perfect
I should've enthusiasmed you should've enthusiasmed he should've enthusiasmed we should've enthusiasmed you should've enthusiasmed they should've enthusiasmed
V-ing perfect
I should've been enthusiasming you should've been enthusiasming he should've been enthusiasming we should've been enthusiasming you should've been enthusiasming they should've been enthusiasming
Negation
Simple form
I shouldn't enthusiasm you shouldn't enthusiasm he shouldn't enthusiasm we shouldn't enthusiasm you shouldn't enthusiasm they shouldn't enthusiasm
V-ing form
I shouldn't be enthusiasming you shouldn't be enthusiasming he shouldn't be enthusiasming we shouldn't be enthusiasming you shouldn't be enthusiasming they shouldn't be enthusiasming
Perfect
I shouldn't have enthusiasmed you shouldn't have enthusiasmed he shouldn't have enthusiasmed we shouldn't have enthusiasmed you shouldn't have enthusiasmed they shouldn't have enthusiasmed
V-ing perfect
I shouldn't have been enthusiasming you shouldn't have been enthusiasming he shouldn't have been enthusiasming we shouldn't have been enthusiasming you shouldn't have been enthusiasming they shouldn't have been enthusiasming
Interrogative form
Simple form
should I enthusiasm? should you enthusiasm? should he enthusiasm? should we enthusiasm? should you enthusiasm? should they enthusiasm?
V-ing form
should I be enthusiasming? should you be enthusiasming? should he be enthusiasming? should we be enthusiasming? should you be enthusiasming? should they be enthusiasming?
Perfect
should I have enthusiasmed? should you have enthusiasmed? should he have enthusiasmed? should we have enthusiasmed? should you have enthusiasmed? should they have enthusiasmed?
V-ing perfect
should I have been enthusiasming? should you have been enthusiasming? should he have been enthusiasming? should we have been enthusiasming? should you have been enthusiasming? should they have been enthusiasming?
Interro-negative form
Simple form
shouldn't I enthusiasm? shouldn't you enthusiasm? shouldn't he enthusiasm? shouldn't we enthusiasm? shouldn't you enthusiasm? shouldn't they enthusiasm?
V-ing form
shouldn't I be enthusiasming? shouldn't you be enthusiasming? shouldn't he be enthusiasming? shouldn't we be enthusiasming? shouldn't you be enthusiasming? shouldn't they be enthusiasming?
Perfect
shouldn't I have enthusiasmed? shouldn't you have enthusiasmed? shouldn't he have enthusiasmed? shouldn't we have enthusiasmed? shouldn't you have enthusiasmed? shouldn't they have enthusiasmed?
V-ing perfect
shouldn't I have been enthusiasming? shouldn't you have been enthusiasming? shouldn't he have been enthusiasming? shouldn't we have been enthusiasming? shouldn't you have been enthusiasming? shouldn't they have been enthusiasming?