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