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