could whiten
Regelmä&szlig;iges Verb: whiten - whitened- whitened

Bestätigung 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
I could whiten
you could whiten
he could whiten
we could whiten
you could whiten
they could whiten 	I could be whitening
you could be whitening
he could be whitening
we could be whitening
you could be whitening
they could be whitening	I could have whitened
you could have whitened
he could have whitened
we could have whitened
you could have whitened
they could have whitened	I could have been whitening
you could have been whitening
he could have been whitening
we could have been whitening
you could have been whitening
they could have been whitening	

Negation 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
I could not whiten
you could not whiten
he could not whiten
we could not whiten
you could not whiten
they could not whiten 	I could not be whitening
you could not be whitening
he could not be whitening
we could not be whitening
you could not be whitening
they could not be whitening	I could not have whitened
you could not have whitened
he could not have whitened
we could not have whitened
you could not have whitened
they could not have whitened	I could not have been whitening
you could not have been whitening
he could not have been whitening
we could not have been whitening
you could not have been whitening
they could not have been whitening	

Fragende Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
could I whiten?
could you whiten?
could he whiten?
could we whiten?
could you whiten?
could they whiten? 	could I be whitening?
could you be whitening?
could he be whitening?
could we be whitening?
could you be whitening?
could they be whitening? 	could I have whitened?
could you have whitened?
could he have whitened?
could we have whitened?
could you have whitened?
could they have whitened? 	could I have been whitening?
could you have been whitening?
could he have been whitening?
could we have been whitening?
could you have been whitening?
could they have been whitening? 	

Fragende Negation Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
could I not whiten?
could you not whiten?
could he not whiten?
could we not whiten?
could you not whiten?
could they not whiten? 	could I not be whitening?
could you not be whitening?
could he not be whitening?
could we not be whitening?
could you not be whitening?
could they not be whitening? 	could I not have whitened?
could you not have whitened?
could he not have whitened?
could we not have whitened?
could you not have whitened?
could they not have whitened? 	could I not have been whitening?
could you not have been whitening?
could he not have been whitening?
could we not have been whitening?
could you not have been whitening?
could they not have been whitening?