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