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