I've been enthusiasming you've been enthusiasming he's been enthusiasming we've been enthusiasming you've been enthusiasming they've been enthusiasming
I'll be enthusiasming you'll be enthusiasming he'll be enthusiasming we'll be enthusiasming you'll be enthusiasming they'll be enthusiasming
Futuro perfecto
I'll have enthusiasmed you'll have enthusiasmed he'll have enthusiasmed we'll have enthusiasmed you'll have enthusiasmed they'll have enthusiasmed
Futuro perfecto contínuo
I'll have been enthusiasming you'll have been enthusiasming he'll have been enthusiasming we'll have been enthusiasming you'll have been enthusiasming they'll have been enthusiasming
I'd be enthusiasming you'd be enthusiasming he'd be enthusiasming we'd be enthusiasming you'd be enthusiasming they'd be enthusiasming
Passado
I'd have enthusiasmed you'd have enthusiasmed he'd have enthusiasmed we'd have enthusiasmed you'd have enthusiasmed they'd have enthusiasmed
Passado continuo
I'd have been enthusiasming you'd have been enthusiasming he'd have been enthusiasming we'd have been enthusiasming you'd have been enthusiasming they'd have been enthusiasming