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Futur antérieur
I'll have ascertained you'll have ascertained he'll have ascertained we'll have ascertained you'll have ascertained they'll have ascertained
Futur antérieur continu
I'll have been ascertaining you'll have been ascertaining he'll have been ascertaining we'll have been ascertaining you'll have been ascertaining they'll have been ascertaining
I'd be ascertaining you'd be ascertaining he'd be ascertaining we'd be ascertaining you'd be ascertaining they'd be ascertaining
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I'd have ascertained you'd have ascertained he'd have ascertained we'd have ascertained you'd have ascertained they'd have ascertained
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I'd have been ascertaining you'd have been ascertaining he'd have been ascertaining we'd have been ascertaining you'd have been ascertaining they'd have been ascertaining