do I occur? do you occur? does he occur? do we occur? do you occur? do they occur?
Present continuous
am I occurring? are you occurring? is he occurring? are we occurring? are you occurring? are they occurring?
Preterite
did I occur? did you occur? did he occur? did we occur? did you occur? did they occur?
Preterite continuous
was I occurring? were you occurring? was he occurring? were we occurring? were you occurring? were they occurring?
Present perfect
have I occurred? have you occurred? has he occurred? have we occurred? have you occurred? have they occurred?
Present perfect continuous
have I been occurring? have you been occurring? has he been occurring? have we been occurring? have you been occurring? have they been occurring?
Pluperfect
had I occurred? had you occurred? had he occurred? had we occurred? had you occurred? had they occurred?
Pluperfect continuous
had I been occurring? had you been occurring? had he been occurring? had we been occurring? had you been occurring? had they been occurring?
Future
will I occur? will you occur? will he occur? will we occur? will you occur? will they occur?
Future continuous
will I be occurring? will you be occurring? will he be occurring? will we be occurring? will you be occurring? will they be occurring?
Future perfect
will I have occurred? will you have occurred? will he have occurred? will we have occurred? will you have occurred? will they have occurred?
Future perfect continuous
will I have been occurring? will you have been occurring? will he have been occurring? will we have been occurring? will you have been occurring? will they have been occurring?
Conditional
Present
would I occur? would you occur? would he occur? would we occur? would you occur? would they occur?
Present continuous
would I be occurring? would you be occurring? would he be occurring? would we be occurring? would you be occurring? would they be occurring?
Past
would I have occurred? would you have occurred? would he have occurred? would we have occurred? would you have occurred? would they have occurred?
Past continuous
would I have been occurring? would you have been occurring? would he have been occurring? would we have been occurring? would you have been occurring? would they have been occurring?