English verb conjugation OUGHT TO HAPPEN

Regular verb: happen - happened - happened


Affirmation

Simple form

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it ought to happen
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V-ing form

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it ought to be happening
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Perfect

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it ought to have happened
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V-ing perfect

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it ought to have been happening
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Negation

Simple form

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it ought not to happen
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V-ing form

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it ought not to happening
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Perfect

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it ought not to have happened
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V-ing perfect

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it ought not to have been happening
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Interrogative form

Simple form

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ought to it happen?
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V-ing form

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ought to it be happening?
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Perfect

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ought to it have happened?
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V-ing perfect

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ought to it have been happening?
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Interro-negative form

Simple form

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ought it not to happen?
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V-ing form

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ought it not to be happening?
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Perfect

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ought it not to have happened?
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V-ing perfect

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ought it not to have been happening?
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