will happen
Verbo regular: happen - happened- happened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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it'll happen
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it'll be happening
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it'll have happened
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it'll have been happening
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Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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it won't happen
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it won't be happening
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it won't have happened
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it won'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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will it happen?
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will it be happening?
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will it have happened?
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will 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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won't it happen?
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won't it be happening?
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won't it have happened?
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won't it have been happening?
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