do I knock? do you knock? does she knock? do we knock? do you knock? do they knock?
Present continuous
am I knocking? are you knocking? is she knocking? are we knocking? are you knocking? are they knocking?
Preterite
did I knock? did you knock? did she knock? did we knock? did you knock? did they knock?
Preterite continuous
was I knocking? were you knocking? was she knocking? were we knocking? were you knocking? were they knocking?
Present perfect
have I knocked? have you knocked? has she knocked? have we knocked? have you knocked? have they knocked?
Present perfect continuous
have I been knocking? have you been knocking? has she been knocking? have we been knocking? have you been knocking? have they been knocking?
Pluperfect
had I knocked? had you knocked? had she knocked? had we knocked? had you knocked? had they knocked?
Pluperfect continuous
had I been knocking? had you been knocking? had she been knocking? had we been knocking? had you been knocking? had they been knocking?
Future
will I knock? will you knock? will she knock? will we knock? will you knock? will they knock?
Future continuous
will I be knocking? will you be knocking? will she be knocking? will we be knocking? will you be knocking? will they be knocking?
Future perfect
will I have knocked? will you have knocked? will she have knocked? will we have knocked? will you have knocked? will they have knocked?
Future perfect continuous
will I have been knocking? will you have been knocking? will she have been knocking? will we have been knocking? will you have been knocking? will they have been knocking?
Conditional
Present
would I knock? would you knock? would she knock? would we knock? would you knock? would they knock?
Present continuous
would I be knocking? would you be knocking? would she be knocking? would we be knocking? would you be knocking? would they be knocking?
Past
would I have knocked? would you have knocked? would she have knocked? would we have knocked? would you have knocked? would they have knocked?
Past continuous
would I have been knocking? would you have been knocking? would she have been knocking? would we have been knocking? would you have been knocking? would they have been knocking?