to happen
Verbo regular: happen - happened- happened

Indicativo 	
Presente 	Presente continuo 	Pretérito 	Pretérito continuo 	
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it happens
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it'shappening
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it happened
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itwashappening
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Presente perfecto 	Presente perfecto continuo 	Pluscuamperfecto 	Pluscuamperfecto continuo 	
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it's happened
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it'sbeen happening
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it'd happened
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it'd been happening
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Futuro simple 	Futuro continuo 	Futuro perfecto 	Futuro perfecto contínuo 	
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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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Condicional 	
Presente 	Presente continuo 	Passado 	Passado continuo 	
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it'd happen
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it'd be happening
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it'd have happened
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it'd have been happening
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Infinitivo 	
Imperativo 	
Infinitivo 	 	Imperativo 	 	
to happen 	 	-
Let's happen
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Participio 	
Presente 	Passado 	 	 	
happening	happened