do I not back? do you not back? does he not back? do we not back? do you not back? do they not back?
Present continuous
am I not backing? are you not backing? is he not backing? are we not backing? are you not backing? are they not backing?
Preterite
did I not back? did you not back? did he not back? did we not back? did you not back? did they not back?
Preterite continuous
was I not backing? were you not backing? was he not backing? were we not backing? were you not backing? were they not backing?
Present perfect
have I not backed? have you not backed? has he not backed? have we not backed? have you not backed? have they not backed?
Present perfect continuous
have I not been backing? have you not been backing? has he not been backing? have we not been backing? have you not been backing? have they not been backing?
Pluperfect
had I not backed? had you not backed? had he not backed? had we not backed? had you not backed? had they not backed?
Pluperfect continuous
had I not been backing? had you not been backing? had he not been backing? had we not been backing? had you not been backing? had they not been backing?
Future
will I not back? will you not back? will he not back? will we not back? will you not back? will they not back?
Future continuous
will I not be backing? will you not be backing? will he not be backing? will we not be backing? will you not be backing? will they not be backing?
Future perfect
will I not have backed? will you not have backed? will he not have backed? will we not have backed? will you not have backed? will they not have backed?
Future perfect continuous
will I not have been backing? will you not have been backing? will he not have been backing? will we not have been backing? will you not have been backing? will they not have been backing?
Conditional
Present
would I not back? would you not back? would he not back? would we not back? would you not back? would they not back?
Present continuous
would I not be backing? would you not be backing? would he not be backing? would we not be backing? would you not be backing? would they not be backing?
Past
would I not have backed? would you not have backed? would he not have backed? would we not have backed? would you not have backed? would they not have backed?
Past continuous
would I not have been backing? would you not have been backing? would he not have been backing? would we not have been backing? would you not have been backing? would they not have been backing?