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