I've been concentrating you've been concentrating he's been concentrating we've been concentrating you've been concentrating they've been concentrating
I'll be concentrating you'll be concentrating he'll be concentrating we'll be concentrating you'll be concentrating they'll be concentrating
Futuro anteriore
I'll have concentrated you'll have concentrated he'll have concentrated we'll have concentrated you'll have concentrated they'll have concentrated
Futuro anteriore contínuo
I'll have been concentrating you'll have been concentrating he'll have been concentrating we'll have been concentrating you'll have been concentrating they'll have been concentrating
I'd be concentrating you'd be concentrating he'd be concentrating we'd be concentrating you'd be concentrating they'd be concentrating
Passato
I'd have concentrated you'd have concentrated he'd have concentrated we'd have concentrated you'd have concentrated they'd have concentrated
Passato continuo
I'd have been concentrating you'd have been concentrating he'd have been concentrating we'd have been concentrating you'd have been concentrating they'd have been concentrating