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