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