would happen
Verbo regular: happen - happened- happened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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it'd happen
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it'd be happening
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it would've happened
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it would've been happening
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Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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it wouldn't happen
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it wouldn't be happening
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it wouldn't have happened
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it wouldn't have been happening
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Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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would it happen?
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would it be happening?
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would it have happened?
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would it have been happening?
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Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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wouldn't it happen?
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wouldn't it be happening?
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wouldn't it have happened?
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wouldn't it have been happening?
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