don't I fasten? don't you fasten? doesn't he 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 he fastening? aren't we fastening? aren't you fastening? aren't they fastening?
Preterite
didn't I fasten? didn't you fasten? didn't he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he have been fastening? wouldn't we have been fastening? wouldn't you have been fastening? wouldn't they have been fastening?