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Other forms without ? | remove negation | remove contraction
Modal : no | may | might | can | could | shall | should | will | would | must | ought to

English verb conjugation TO HAPPEN

Regular verb: happen - happened - happened

Indicative

Present
-
-
doesn't it happen?
-
-
-
Present continuous
-
-
isn't it happening?
-
-
-
Preterite
-
-
didn't it happen?
-
-
-
Preterite continuous
-
-
wasn't it happening?
-
-
-
Present perfect
-
-
hasn't it happened?
-
-
-
Present perfect continuous
-
-
hasn't it been happening?
-
-
-
Pluperfect
-
-
hadn't it happened?
-
-
-
Pluperfect continuous
-
-
hadn't it been happening?
-
-
-
Future
-
-
won't it happen?
-
-
-
Future continuous
-
-
won't it be happening?
-
-
-
Future perfect
-
-
won't it have happened?
-
-
-
Future perfect continuous
-
-
won't it have been happening?
-
-
-

Conditional

Present
-
-
wouldn't it happen?
-
-
-
Present continuous
-
-
wouldn't it be happening?
-
-
-
Past
-
-
wouldn't it have happened?
-
-
-
Past continuous
-
-
wouldn't it have been happening?
-
-
-

Imperative

Imperative
-
-
-
 
 
 

Infinitive

Infinitive
to happen
 
 
 

Participle

Present
happening
Past
happened