I'll be stiffening you'll be stiffening she'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 she'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 she'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 she'd be stiffening we'd be stiffening you'd be stiffening they'd be stiffening
Passé
I'd have stiffened you'd have stiffened she'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 she'd have been stiffening we'd have been stiffening you'd have been stiffening they'd have been stiffening