do I not curb? do you not curb? does she not curb? do we not curb? do you not curb? do they not curb?
Present continuous
am I not curbing? are you not curbing? is she not curbing? are we not curbing? are you not curbing? are they not curbing?
Preterite
did I not curb? did you not curb? did she not curb? did we not curb? did you not curb? did they not curb?
Preterite continuous
was I not curbing? were you not curbing? was she not curbing? were we not curbing? were you not curbing? were they not curbing?
Present perfect
have I not curbed? have you not curbed? has she not curbed? have we not curbed? have you not curbed? have they not curbed?
Present perfect continuous
have I not been curbing? have you not been curbing? has she not been curbing? have we not been curbing? have you not been curbing? have they not been curbing?
Pluperfect
had I not curbed? had you not curbed? had she not curbed? had we not curbed? had you not curbed? had they not curbed?
Pluperfect continuous
had I not been curbing? had you not been curbing? had she not been curbing? had we not been curbing? had you not been curbing? had they not been curbing?
Future
will I not curb? will you not curb? will she not curb? will we not curb? will you not curb? will they not curb?
Future continuous
will I not be curbing? will you not be curbing? will she not be curbing? will we not be curbing? will you not be curbing? will they not be curbing?
Future perfect
will I not have curbed? will you not have curbed? will she not have curbed? will we not have curbed? will you not have curbed? will they not have curbed?
Future perfect continuous
will I not have been curbing? will you not have been curbing? will she not have been curbing? will we not have been curbing? will you not have been curbing? will they not have been curbing?
Conditional
Present
would I not curb? would you not curb? would she not curb? would we not curb? would you not curb? would they not curb?
Present continuous
would I not be curbing? would you not be curbing? would she not be curbing? would we not be curbing? would you not be curbing? would they not be curbing?
Past
would I not have curbed? would you not have curbed? would she not have curbed? would we not have curbed? would you not have curbed? would they not have curbed?
Past continuous
would I not have been curbing? would you not have been curbing? would she not have been curbing? would we not have been curbing? would you not have been curbing? would they not have been curbing?