English verb conjugation TO HAPPEN

Regular verb: happen - happened - happened

Indicative

Present

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it happens
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-

Present continuous

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it's happening
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Preterite

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it happened
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Preterite continuous

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it was happening
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Present perfect

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it's happened
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Present perfect continuous

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it's been happening
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Pluperfect

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it'd happened
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Pluperfect continuous

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it'd been happening
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Future

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it'll happen
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Future continuous

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it'll be happening
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Future perfect

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it'll have happened
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Future perfect continuous

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it'll have been happening
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Present

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it'd happen
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-

Present continuous

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it'd be happening
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Past

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it'd have happened
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Past continuous

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it'd have been happening
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-

-
Let's happen
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to happen

Present

happening

Past

happened