should happen
Regelmä&szlig;iges Verb: happen - happened- happened

Bestätigung 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
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it should happen
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- 	-
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it should be happening
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- 	-
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it should have happened
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- 	-
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it should have been happening
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- 	

Negation 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
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it should not happen
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it should not be happening
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- 	-
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it should not have happened
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- 	-
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it should not have been happening
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Fragende Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
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should it happen?
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-
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should it be happening?
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- 	-
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should it have happened?
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- 	-
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should it have been happening?
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Fragende Negation Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
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should it not happen?
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- 	-
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should it not be happening?
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- 	-
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should it not have happened?
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- 	-
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should it not have been happening?
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