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