I'll be prefacing you'll be prefacing he'll be prefacing we'll be prefacing you'll be prefacing they'll be prefacing
Futuro perfecto
I'll have prefaced you'll have prefaced he'll have prefaced we'll have prefaced you'll have prefaced they'll have prefaced
Futuro perfecto contínuo
I'll have been prefacing you'll have been prefacing he'll have been prefacing we'll have been prefacing you'll have been prefacing they'll have been prefacing
I'd be prefacing you'd be prefacing he'd be prefacing we'd be prefacing you'd be prefacing they'd be prefacing
Passado
I'd have prefaced you'd have prefaced he'd have prefaced we'd have prefaced you'd have prefaced they'd have prefaced
Passado continuo
I'd have been prefacing you'd have been prefacing he'd have been prefacing we'd have been prefacing you'd have been prefacing they'd have been prefacing