do I not prevent? do you not prevent? does he not prevent? do we not prevent? do you not prevent? do they not prevent?
Presente contínuo
am I not preventing? are you not preventing? is he not preventing? are we not preventing? are you not preventing? are they not preventing?
Pretérito
did I not prevent? did you not prevent? did he not prevent? did we not prevent? did you not prevent? did they not prevent?
Preterito contínuo
was I not preventing? were you not preventing? was he not preventing? were we not preventing? were you not preventing? were they not preventing?
Presente perfeito
have I not prevented? have you not prevented? has he not prevented? have we not prevented? have you not prevented? have they not prevented?
Presente perfeito contínuo
have I not been preventing? have you not been preventing? has he not been preventing? have we not been preventing? have you not been preventing? have they not been preventing?
Mais perfeito
had I not prevented? had you not prevented? had he not prevented? had we not prevented? had you not prevented? had they not prevented?
Contínuo mais perfeito
had I not been preventing? had you not been preventing? had he not been preventing? had we not been preventing? had you not been preventing? had they not been preventing?
Futuro
will I not prevent? will you not prevent? will he not prevent? will we not prevent? will you not prevent? will they not prevent?
Futuro contínuo
will I not be preventing? will you not be preventing? will he not be preventing? will we not be preventing? will you not be preventing? will they not be preventing?
futuro perfeito
will I not have prevented? will you not have prevented? will he not have prevented? will we not have prevented? will you not have prevented? will they not have prevented?
futuro perfeito contínuo
will I not have been preventing? will you not have been preventing? will he not have been preventing? will we not have been preventing? will you not have been preventing? will they not have been preventing?
Condicional
Presente
would I not prevent? would you not prevent? would he not prevent? would we not prevent? would you not prevent? would they not prevent?
Presente contínuo
would I not be preventing? would you not be preventing? would he not be preventing? would we not be preventing? would you not be preventing? would they not be preventing?
Passado
would I not have prevented? would you not have prevented? would he not have prevented? would we not have prevented? would you not have prevented? would they not have prevented?
Passado contínuo
would I not have been preventing? would you not have been preventing? would he not have been preventing? would we not have been preventing? would you not have been preventing? would they not have been preventing?