I've been extemporising you've been extemporising he's been extemporising we've been extemporising you've been extemporising they've been extemporising
I'll be extemporising you'll be extemporising he'll be extemporising we'll be extemporising you'll be extemporising they'll be extemporising
Futuro perfecto
I'll have extemporised you'll have extemporised he'll have extemporised we'll have extemporised you'll have extemporised they'll have extemporised
Futuro perfecto contínuo
I'll have been extemporising you'll have been extemporising he'll have been extemporising we'll have been extemporising you'll have been extemporising they'll have been extemporising
I'd be extemporising you'd be extemporising he'd be extemporising we'd be extemporising you'd be extemporising they'd be extemporising
Passado
I'd have extemporised you'd have extemporised he'd have extemporised we'd have extemporised you'd have extemporised they'd have extemporised
Passado continuo
I'd have been extemporising you'd have been extemporising he'd have been extemporising we'd have been extemporising you'd have been extemporising they'd have been extemporising