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