do I not certify? do you not certify? does she not certify? do we not certify? do you not certify? do they not certify?
Presente continuo
am I not certifying? are you not certifying? is she not certifying? are we not certifying? are you not certifying? are they not certifying?
Pretérito
did I not certify? did you not certify? did she not certify? did we not certify? did you not certify? did they not certify?
Pretérito continuo
was I not certifying? were you not certifying? was she not certifying? were we not certifying? were you not certifying? were they not certifying?
Presente perfecto
have I not certified? have you not certified? has she not certified? have we not certified? have you not certified? have they not certified?
Presente perfecto continuo
have I not been certifying? have you not been certifying? has she not been certifying? have we not been certifying? have you not been certifying? have they not been certifying?
Pluscuamperfecto
had I not certified? had you not certified? had she not certified? had we not certified? had you not certified? had they not certified?
Pluscuamperfecto continuo
had I not been certifying? had you not been certifying? had she not been certifying? had we not been certifying? had you not been certifying? had they not been certifying?
Futuro simple
will I not certify? will you not certify? will she not certify? will we not certify? will you not certify? will they not certify?
Futuro continuo
will I not be certifying? will you not be certifying? will she not be certifying? will we not be certifying? will you not be certifying? will they not be certifying?
Futuro perfecto
will I not have certified? will you not have certified? will she not have certified? will we not have certified? will you not have certified? will they not have certified?
Futuro perfecto contínuo
will I not have been certifying? will you not have been certifying? will she not have been certifying? will we not have been certifying? will you not have been certifying? will they not have been certifying?
Condicional
Presente
would I not certify? would you not certify? would she not certify? would we not certify? would you not certify? would they not certify?
Presente continuo
would I not be certifying? would you not be certifying? would she not be certifying? would we not be certifying? would you not be certifying? would they not be certifying?
Passado
would I not have certified? would you not have certified? would she not have certified? would we not have certified? would you not have certified? would they not have certified?
Passado continuo
would I not have been certifying? would you not have been certifying? would she not have been certifying? would we not have been certifying? would you not have been certifying? would they not have been certifying?