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