Conjugaison du verbe anglais COULD THUNDER
Verbe régulier : thunder -  thundered - thundered
Traduction française : tonner - lancer d'une voix tonitruante ou tonnante 
Affirmation
Forme simple
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it could thunder
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Forme en V-ing
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it could be thundering
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Perfect
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it could have thundered
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Perfect en V-ing
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it could have been thundering
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Négation
Forme simple
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it couldn't thunder
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Forme en V-ing
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it couldn't be thundering
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Perfect
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it couldn't have thundered
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Perfect en V-ing
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it couldn't have been thundering
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Forme interrogative
Forme simple
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could it thunder?
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Forme en V-ing
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could it be thundering?
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Perfect
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could it have thundered?
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Perfect en V-ing
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could it have been thundering?
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Forme interro-négative
Forme simple
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couldn't it thunder?
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Forme en V-ing
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couldn't it be thundering?
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Perfect
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couldn't it have thundered?
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Perfect en V-ing
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couldn't it have been thundering?
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Verbe au hasard
abide - amplify - appeal - associate - awaken - be - cant - collect - count - derive - develop - drink - eat - enure - escalate - fight - fix - focus - grind - hint - imprison - keep - leap - out - parameterize - practice - recommend - request - rest - restore - seem - shed - sin - sleep - smoke - solder - stare - sway - sweep - to be - to do - to go - to have - wax