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