English verb conjugation TO HAPPEN

Regular verb: happen - happened - happened

Indicative

Present

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does it happen?
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Present continuous

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is it happening?
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Preterite

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did it happen?
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Preterite continuous

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was it happening?
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Present perfect

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has it happened?
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Present perfect continuous

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has it been happening?
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Pluperfect

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had it happened?
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Pluperfect continuous

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had it been happening?
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Future

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will it happen?
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Future continuous

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will it be happening?
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Future perfect

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will it have happened?
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Future perfect continuous

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will it have been happening?
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Present

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would it happen?
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Present continuous

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would it be happening?
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Past

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would it have happened?
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Past continuous

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would it have been happening?
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to happen

Present

happening

Past

happened