I'll be stiffening you'll be stiffening he'll be stiffening we'll be stiffening you'll be stiffening they'll be stiffening
Futur antérieur
I'll have stiffened you'll have stiffened he'll have stiffened we'll have stiffened you'll have stiffened they'll have stiffened
Futur antérieur continu
I'll have been stiffening you'll have been stiffening he'll have been stiffening we'll have been stiffening you'll have been stiffening they'll have been stiffening
I'd be stiffening you'd be stiffening he'd be stiffening we'd be stiffening you'd be stiffening they'd be stiffening
Passé
I'd have stiffened you'd have stiffened he'd have stiffened we'd have stiffened you'd have stiffened they'd have stiffened
Passé continu
I'd have been stiffening you'd have been stiffening he'd have been stiffening we'd have been stiffening you'd have been stiffening they'd have been stiffening