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