I'll be fastening you'll be fastening he'll be fastening we'll be fastening you'll be fastening they'll be fastening
futuro perfeito
I'll have fastened you'll have fastened he'll have fastened we'll have fastened you'll have fastened they'll have fastened
futuro perfeito contínuo
I'll have been fastening you'll have been fastening he'll have been fastening we'll have been fastening you'll have been fastening they'll have been fastening
I'd be fastening you'd be fastening he'd be fastening we'd be fastening you'd be fastening they'd be fastening
Passado
I'd have fastened you'd have fastened he'd have fastened we'd have fastened you'd have fastened they'd have fastened
Passado contínuo
I'd have been fastening you'd have been fastening he'd have been fastening we'd have been fastening you'd have been fastening they'd have been fastening