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 contínuo
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?
Preterito contínuo
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 perfeito
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 perfeito contínuo
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?
Mais perfeito
hadn't I prevented? hadn't you prevented? hadn't he prevented? hadn't we prevented? hadn't you prevented? hadn't they prevented?
Contínuo mais perfeito
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
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 contínuo
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 perfeito
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 perfeito 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 contínuo
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 contínuo
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?