I'll be stiffering you'll be stiffering he'll be stiffering we'll be stiffering you'll be stiffering they'll be stiffering
Futuro anteriore
I'll have stiffered you'll have stiffered he'll have stiffered we'll have stiffered you'll have stiffered they'll have stiffered
Futuro anteriore contínuo
I'll have been stiffering you'll have been stiffering he'll have been stiffering we'll have been stiffering you'll have been stiffering they'll have been stiffering
I'd be stiffering you'd be stiffering he'd be stiffering we'd be stiffering you'd be stiffering they'd be stiffering
Passato
I'd have stiffered you'd have stiffered he'd have stiffered we'd have stiffered you'd have stiffered they'd have stiffered
Passato continuo
I'd have been stiffering you'd have been stiffering he'd have been stiffering we'd have been stiffering you'd have been stiffering they'd have been stiffering