can 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 can happen
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-
- 	-
-
it can be happening
-
-
- 	-
-
it can have happened
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-
- 	-
-
it can have been happening
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-
- 	

Negation 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
-
-
it cannot happen
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-
- 	-
-
it cannot be happening
-
-
- 	-
-
it cannot have happened
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-
- 	-
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it cannot have been happening
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-
- 	

Fragende Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
-
-
can it happen?
-
-
- 	-
-
can it be happening?
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-
- 	-
-
can it have happened?
-
-
- 	-
-
can it have been happening?
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-
- 	

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