to happen
Verbo regolare: happen - happened- happened

Indicativo 	
Presente 	Presente continuo 	Preterito 	Preterite continua 	
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it doesnot happen
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-
- 	-
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itisnot happening
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-
- 	-
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it did not happen
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- 	-
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itwasnot happening
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-
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Presente perfetto 	Presente perfetto continuo 	Piuccheperfetto 	Piuccheperfetto continuo 	
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ithasnot happened
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-
- 	-
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ithasnot  been happening
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- 	-
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it had not happened
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-
- 	-
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it had not been happening
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- 	
Futuro semplice 	Futuro continuo 	Futuro anteriore 	Futuro anteriore contínuo 	
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it will not happen
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-
- 	-
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it will not be happening
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-
- 	-
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it will not have happened
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- 	-
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it will not have been happening
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- 	

Condizionale 	
Presente 	Presente continuo 	Passato 	Passato continuo 	
-
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it would not happen
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-
- 	-
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it would not be happening
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-
- 	-
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it would not have happened
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- 	-
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it would not have been happening
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- 	

Infinito 	
Imperativo 	
Infinito 	 	Imperativo 	 	
to happen 	 	-
Let's not happen
-

Participio 	
Presente 	Passato 	 	 	
happening	happened