to happen
Verbo regular: happen - happened- happened

Indicativo 	
Presente 	Presente continuo 	Pretérito 	Pretérito continuo 	
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doesit not happen?
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isit not happening?
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-
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did it not happen?
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wasit not happening?
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Presente perfecto 	Presente perfecto continuo 	Pluscuamperfecto 	Pluscuamperfecto continuo 	
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hasit not happened?
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hasit not been happening?
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had it not happened?
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had it not been happening?
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Futuro simple 	Futuro continuo 	Futuro perfecto 	Futuro perfecto contínuo 	
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will it not happen?
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will it not be happening?
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will it not have happened?
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will it not have been happening?
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- 	

Condicional 	
Presente 	Presente continuo 	Passado 	Passado continuo 	
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would it not happen?
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would it not be happening?
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-
- 	-
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would it not have happened?
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would it not have been happening?
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Infinitivo 	
Imperativo 	
Infinitivo 	 	Imperativo 	 	
to happen 	 	-
-
- 	 	

Participio 	
Presente 	Passado 	 	 	
happening	happened