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