I'll be preventing you'll be preventing he'll be preventing we'll be preventing you'll be preventing they'll be preventing
Futuro anteriore
I'll have prevented you'll have prevented he'll have prevented we'll have prevented you'll have prevented they'll have prevented
Futuro anteriore contínuo
I'll have been preventing you'll have been preventing he'll have been preventing we'll have been preventing you'll have been preventing they'll have been preventing
I'd be preventing you'd be preventing he'd be preventing we'd be preventing you'd be preventing they'd be preventing
Passato
I'd have prevented you'd have prevented he'd have prevented we'd have prevented you'd have prevented they'd have prevented
Passato continuo
I'd have been preventing you'd have been preventing he'd have been preventing we'd have been preventing you'd have been preventing they'd have been preventing