could ventilate
Regelmä&szlig;iges Verb: ventilate - ventilated- ventilated

Bestätigung 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
I could ventilate
you could ventilate
he could ventilate
we could ventilate
you could ventilate
they could ventilate 	I could be ventilating
you could be ventilating
he could be ventilating
we could be ventilating
you could be ventilating
they could be ventilating	I could have ventilated
you could have ventilated
he could have ventilated
we could have ventilated
you could have ventilated
they could have ventilated	I could have been ventilating
you could have been ventilating
he could have been ventilating
we could have been ventilating
you could have been ventilating
they could have been ventilating	

Negation 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
I couldn't ventilate
you couldn't ventilate
he couldn't ventilate
we couldn't ventilate
you couldn't ventilate
they couldn't ventilate 	I couldn't be ventilating
you couldn't be ventilating
he couldn't be ventilating
we couldn't be ventilating
you couldn't be ventilating
they couldn't be ventilating	I couldn't have ventilated
you couldn't have ventilated
he couldn't have ventilated
we couldn't have ventilated
you couldn't have ventilated
they couldn't have ventilated	I couldn't have been ventilating
you couldn't have been ventilating
he couldn't have been ventilating
we couldn't have been ventilating
you couldn't have been ventilating
they couldn't have been ventilating	

Fragende Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
could I ventilate?
could you ventilate?
could he ventilate?
could we ventilate?
could you ventilate?
could they ventilate? 	could I be ventilating?
could you be ventilating?
could he be ventilating?
could we be ventilating?
could you be ventilating?
could they be ventilating? 	could I have ventilated?
could you have ventilated?
could he have ventilated?
could we have ventilated?
could you have ventilated?
could they have ventilated? 	could I have been ventilating?
could you have been ventilating?
could he have been ventilating?
could we have been ventilating?
could you have been ventilating?
could they have been ventilating? 	

Fragende Negation Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
couldn't I ventilate?
couldn't you ventilate?
couldn't he ventilate?
couldn't we ventilate?
couldn't you ventilate?
couldn't they ventilate? 	couldn't I be ventilating?
couldn't you be ventilating?
couldn't he be ventilating?
couldn't we be ventilating?
couldn't you be ventilating?
couldn't they be ventilating? 	couldn't I have ventilated?
couldn't you have ventilated?
couldn't he have ventilated?
couldn't we have ventilated?
couldn't you have ventilated?
couldn't they have ventilated? 	couldn't I have been ventilating?
couldn't you have been ventilating?
couldn't he have been ventilating?
couldn't we have been ventilating?
couldn't you have been ventilating?
couldn't they have been ventilating?