don't I sum? don't you sum? doesn't he sum? don't we sum? don't you sum? don't they sum?
Present continuous
am I not summing? aren't you summing? isn't he summing? aren't we summing? aren't you summing? aren't they summing?
Preterite
didn't I sum? didn't you sum? didn't he sum? didn't we sum? didn't you sum? didn't they sum?
Preterite continuous
wasn't I summing? weren't you summing? wasn't he summing? weren't we summing? weren't you summing? weren't they summing?
Present perfect
haven't I summed? haven't you summed? hasn't he summed? haven't we summed? haven't you summed? haven't they summed?
Present perfect continuous
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?
Pluperfect
hadn't I summed? hadn't you summed? hadn't he summed? hadn't we summed? hadn't you summed? hadn't they summed?
Pluperfect continuous
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?
Future
won't I sum? won't you sum? won't he sum? won't we sum? won't you sum? won't they sum?
Future continuous
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?
Future perfect
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?
Future perfect continuous
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?
Conditional
Present
wouldn't I sum? wouldn't you sum? wouldn't he sum? wouldn't we sum? wouldn't you sum? wouldn't they sum?
Present continuous
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?
Past
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?
Past continuous
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?