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
--
it ought to be happening
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Perfect
--
it ought to have happened
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V-ing perfect
--
it ought to have been happening
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Negation
Simple form
--
it ought not to happen
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V-ing form
--
it ought not to happening
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Perfect
--
it ought not to have happened
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V-ing perfect
--
it ought not to have been happening
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Interrogative form
Simple form
--
ought to it happen?
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V-ing form
--
ought to it be happening?
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Perfect
--
ought to it have happened?
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V-ing perfect
--
ought to it have been happening?
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Interro-negative form
Simple form
--
ought it not to happen?
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V-ing form
--
ought it not to be happening?
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Perfect
--
ought it not to have happened?
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V-ing perfect
--
ought it not to have been happening?
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