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