English verb conjugation TO HAPPEN

Regular verb: happen - happened - happened

Indicative

Present

-
-
does it not happen?
-
-
-

Present continuous

-
-
is it not happening?
-
-
-

Preterite

-
-
did it not happen?
-
-
-

Preterite continuous

-
-
was it not happening?
-
-
-

Present perfect

-
-
has it not happened?
-
-
-

Present perfect continuous

-
-
has it not been happening?
-
-
-

Pluperfect

-
-
had it not happened?
-
-
-

Pluperfect continuous

-
-
had it not been happening?
-
-
-

Future

-
-
will it not happen?
-
-
-

Future continuous

-
-
will it not be happening?
-
-
-

Future perfect

-
-
will it not have happened?
-
-
-

Future perfect continuous

-
-
will it not have been happening?
-
-
-

Present

-
-
would it not happen?
-
-
-

Present continuous

-
-
would it not be happening?
-
-
-

Past

-
-
would it not have happened?
-
-
-

Past continuous

-
-
would it not have been happening?
-
-
-

-
-
-

to happen

Present

happening

Past

happened