don't I prevent? don't you prevent? doesn't he prevent? don't we prevent? don't you prevent? don't they prevent?
Presente continuo
am I not preventing? aren't you preventing? isn't he preventing? aren't we preventing? aren't you preventing? aren't they preventing?
Pretérito
didn't I prevent? didn't you prevent? didn't he prevent? didn't we prevent? didn't you prevent? didn't they prevent?
Pretérito continuo
wasn't I preventing? weren't you preventing? wasn't he preventing? weren't we preventing? weren't you preventing? weren't they preventing?
Presente perfecto
haven't I prevented? haven't you prevented? hasn't he prevented? haven't we prevented? haven't you prevented? haven't they prevented?
Presente perfecto continuo
haven't I been preventing? haven't you been preventing? hasn't he been preventing? haven't we been preventing? haven't you been preventing? haven't they been preventing?
Pluscuamperfecto
hadn't I prevented? hadn't you prevented? hadn't he prevented? hadn't we prevented? hadn't you prevented? hadn't they prevented?
Pluscuamperfecto continuo
hadn't I been preventing? hadn't you been preventing? hadn't he been preventing? hadn't we been preventing? hadn't you been preventing? hadn't they been preventing?
Futuro simple
won't I prevent? won't you prevent? won't he prevent? won't we prevent? won't you prevent? won't they prevent?
Futuro continuo
won't I be preventing? won't you be preventing? won't he be preventing? won't we be preventing? won't you be preventing? won't they be preventing?
Futuro perfecto
won't I have prevented? won't you have prevented? won't he have prevented? won't we have prevented? won't you have prevented? won't they have prevented?
Futuro perfecto contínuo
won't I have been preventing? won't you have been preventing? won't he have been preventing? won't we have been preventing? won't you have been preventing? won't they have been preventing?
Condicional
Presente
wouldn't I prevent? wouldn't you prevent? wouldn't he prevent? wouldn't we prevent? wouldn't you prevent? wouldn't they prevent?
Presente continuo
wouldn't I be preventing? wouldn't you be preventing? wouldn't he be preventing? wouldn't we be preventing? wouldn't you be preventing? wouldn't they be preventing?
Passado
wouldn't I have prevented? wouldn't you have prevented? wouldn't he have prevented? wouldn't we have prevented? wouldn't you have prevented? wouldn't they have prevented?
Passado continuo
wouldn't I have been preventing? wouldn't you have been preventing? wouldn't he have been preventing? wouldn't we have been preventing? wouldn't you have been preventing? wouldn't they have been preventing?