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