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Modal : no | may | might | can | could | shall | should | will | would | must | ought to

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 oughtn't to happen
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V-ing form
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it oughtn't to be happening
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Perfect
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it oughtn't to have happened
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V-ing perfect
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it oughtn't 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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oughtn't it to happen?
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V-ing form
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oughtn't it to be happening?
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Perfect
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oughtn't it to have happened?
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V-ing perfect
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oughtn't it to have been happening?
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