I've been preascertaining you've been preascertaining she's been preascertaining we've been preascertaining you've been preascertaining they've been preascertaining
I'd been preascertaining you'd been preascertaining she'd been preascertaining we'd been preascertaining you'd been preascertaining they'd been preascertaining
I'll be preascertaining you'll be preascertaining she'll be preascertaining we'll be preascertaining you'll be preascertaining they'll be preascertaining
Futur perfekt
I'll have preascertained you'll have preascertained she'll have preascertained we'll have preascertained you'll have preascertained they'll have preascertained
Futur perfekt kontinuierlich
I'll have been preascertaining you'll have been preascertaining she'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 she'd be preascertaining we'd be preascertaining you'd be preascertaining they'd be preascertaining
Perfekt
I'd have preascertained you'd have preascertained she'd have preascertained we'd have preascertained you'd have preascertained they'd have preascertained
Perfekt kontinuierlich
I'd have been preascertaining you'd have been preascertaining she'd have been preascertaining we'd have been preascertaining you'd have been preascertaining they'd have been preascertaining