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