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