English verb conjugation TO HAPPEN

Regular verb: happen - happened - happened

Indicative

Present

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doesn't it happen?
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Present continuous

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isn't it happening?
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Preterite

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didn't it happen?
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Preterite continuous

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wasn't it happening?
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Present perfect

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hasn't it happened?
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Present perfect continuous

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hasn't it been happening?
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Pluperfect

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hadn't it happened?
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-
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Pluperfect continuous

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hadn't it been happening?
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Future

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won't it happen?
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Future continuous

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won't it be happening?
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Future perfect

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won't it have happened?
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Future perfect continuous

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won't it have been happening?
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Present

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wouldn't it happen?
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Present continuous

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wouldn't it be happening?
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Past

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wouldn't it have happened?
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Past continuous

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wouldn't it have been happening?
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to happen

Present

happening

Past

happened