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
Future perfect
I'll have concentrated you'll have concentrated he'll have concentrated we'll have concentrated you'll have concentrated they'll have concentrated
Future perfect continuous
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
Past
I'd have concentrated you'd have concentrated he'd have concentrated we'd have concentrated you'd have concentrated they'd have concentrated
Past continuous
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