Conjugaison du verbe anglais COULD HAPPEN
Verbe régulier : happen -  happened - happened
Traduction française : arriver - se passer 
Affirmation
Forme simple
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it could happen
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Forme en V-ing
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it could be happening
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Perfect
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it could have happened
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Perfect en V-ing
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it could have been happening
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Négation
Forme simple
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it couldn't happen
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Forme en V-ing
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it couldn't be happening
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Perfect
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it couldn't have happened
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Perfect en V-ing
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it couldn't have been happening
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Forme interrogative
Forme simple
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could it happen?
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Forme en V-ing
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could it be happening?
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Perfect
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could it have happened?
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Perfect en V-ing
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could it have been happening?
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Forme interro-négative
Forme simple
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couldn't it happen?
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Forme en V-ing
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couldn't it be happening?
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Perfect
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couldn't it have happened?
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Perfect en V-ing
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couldn't it have been happening?
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Verbe au hasard
accord - annoy - argue - climb - couple - creep - crown - debit - delete - discard - dive - dull - egress - fell - fluster - form - get - guarantee - imprison - interview - invite - laugh - mend - monger - mosh - motivate - owe - parameterize - party - proceed - prove - publish - rage - sign - sink - stare - stay - sting - strike - sunbathe - to be - to do - to go - to have