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