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