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