Conjugaison du verbe anglais MUST HAPPEN
Verbe régulier : happen -  happened - happened
Traduction française : arriver - se passer 
Affirmation
Forme simple
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it must happen
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Forme en V-ing
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it must be happening
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Perfect
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it must have happened
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Perfect en V-ing
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it must have been happening
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Négation
Forme simple
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it mustn't happen
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Forme en V-ing
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it mustn't be happening
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Perfect
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it mustn't have happened
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Perfect en V-ing
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it mustn't have been happening
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Forme interrogative
Forme simple
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must it happen?
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Forme en V-ing
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must it be happening?
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Perfect
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must it have happened?
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Perfect en V-ing
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must it have been happening?
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Forme interro-négative
Forme simple
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mustn't it happen?
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Forme en V-ing
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mustn't it be happening?
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Perfect
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mustn't it have happened?
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Perfect en V-ing
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mustn't it have been happening?
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Verbe au hasard
accompany - ape - bang - blur - coast - coffer - covet - crab - cycle - deploy - designate - die - display - draft - ensure - hospitalize - hurry - impress - intensify - interview - issue - knock - learn - let - negative - operate - park - participate - ping - pull - put - remove - run - scribe - see - sigh - survive - taste - to be - to do - to go - to have - transmit - undo