don't I subtract? don't you subtract? doesn't he subtract? don't we subtract? don't you subtract? don't they subtract?
Present continuous
am I not subtracting? aren't you subtracting? isn't he subtracting? aren't we subtracting? aren't you subtracting? aren't they subtracting?
Preterite
didn't I subtract? didn't you subtract? didn't he subtract? didn't we subtract? didn't you subtract? didn't they subtract?
Preterite continuous
wasn't I subtracting? weren't you subtracting? wasn't he subtracting? weren't we subtracting? weren't you subtracting? weren't they subtracting?
Present perfect
haven't I subtracted? haven't you subtracted? hasn't he subtracted? haven't we subtracted? haven't you subtracted? haven't they subtracted?
Present perfect continuous
haven't I been subtracting? haven't you been subtracting? hasn't he been subtracting? haven't we been subtracting? haven't you been subtracting? haven't they been subtracting?
Pluperfect
hadn't I subtracted? hadn't you subtracted? hadn't he subtracted? hadn't we subtracted? hadn't you subtracted? hadn't they subtracted?
Pluperfect continuous
hadn't I been subtracting? hadn't you been subtracting? hadn't he been subtracting? hadn't we been subtracting? hadn't you been subtracting? hadn't they been subtracting?
Future
won't I subtract? won't you subtract? won't he subtract? won't we subtract? won't you subtract? won't they subtract?
Future continuous
won't I be subtracting? won't you be subtracting? won't he be subtracting? won't we be subtracting? won't you be subtracting? won't they be subtracting?
Future perfect
won't I have subtracted? won't you have subtracted? won't he have subtracted? won't we have subtracted? won't you have subtracted? won't they have subtracted?
Future perfect continuous
won't I have been subtracting? won't you have been subtracting? won't he have been subtracting? won't we have been subtracting? won't you have been subtracting? won't they have been subtracting?
Conditional
Present
wouldn't I subtract? wouldn't you subtract? wouldn't he subtract? wouldn't we subtract? wouldn't you subtract? wouldn't they subtract?
Present continuous
wouldn't I be subtracting? wouldn't you be subtracting? wouldn't he be subtracting? wouldn't we be subtracting? wouldn't you be subtracting? wouldn't they be subtracting?
Past
wouldn't I have subtracted? wouldn't you have subtracted? wouldn't he have subtracted? wouldn't we have subtracted? wouldn't you have subtracted? wouldn't they have subtracted?
Past continuous
wouldn't I have been subtracting? wouldn't you have been subtracting? wouldn't he have been subtracting? wouldn't we have been subtracting? wouldn't you have been subtracting? wouldn't they have been subtracting?