I've been corroborating you've been corroborating he's been corroborating we've been corroborating you've been corroborating they've been corroborating
I'll be corroborating you'll be corroborating he'll be corroborating we'll be corroborating you'll be corroborating they'll be corroborating
Future perfect
I'll have corroborated you'll have corroborated he'll have corroborated we'll have corroborated you'll have corroborated they'll have corroborated
Future perfect continuous
I'll have been corroborating you'll have been corroborating he'll have been corroborating we'll have been corroborating you'll have been corroborating they'll have been corroborating
I'd be corroborating you'd be corroborating he'd be corroborating we'd be corroborating you'd be corroborating they'd be corroborating
Past
I'd have corroborated you'd have corroborated he'd have corroborated we'd have corroborated you'd have corroborated they'd have corroborated
Past continuous
I'd have been corroborating you'd have been corroborating he'd have been corroborating we'd have been corroborating you'd have been corroborating they'd have been corroborating