could stiffen
Regelmä&szlig;iges Verb: stiffen - stiffened- stiffened

Bestätigung 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
I could stiffen
you could stiffen
she could stiffen
we could stiffen
you could stiffen
they could stiffen 	I could be stiffening
you could be stiffening
she could be stiffening
we could be stiffening
you could be stiffening
they could be stiffening	I could have stiffened
you could have stiffened
she could have stiffened
we could have stiffened
you could have stiffened
they could have stiffened	I could have been stiffening
you could have been stiffening
she could have been stiffening
we could have been stiffening
you could have been stiffening
they could have been stiffening	

Negation 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
I could not stiffen
you could not stiffen
she could not stiffen
we could not stiffen
you could not stiffen
they could not stiffen 	I could not be stiffening
you could not be stiffening
she could not be stiffening
we could not be stiffening
you could not be stiffening
they could not be stiffening	I could not have stiffened
you could not have stiffened
she could not have stiffened
we could not have stiffened
you could not have stiffened
they could not have stiffened	I could not have been stiffening
you could not have been stiffening
she could not have been stiffening
we could not have been stiffening
you could not have been stiffening
they could not have been stiffening	

Fragende Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
could I stiffen?
could you stiffen?
could she stiffen?
could we stiffen?
could you stiffen?
could they stiffen? 	could I be stiffening?
could you be stiffening?
could she be stiffening?
could we be stiffening?
could you be stiffening?
could they be stiffening? 	could I have stiffened?
could you have stiffened?
could she have stiffened?
could we have stiffened?
could you have stiffened?
could they have stiffened? 	could I have been stiffening?
could you have been stiffening?
could she have been stiffening?
could we have been stiffening?
could you have been stiffening?
could they have been stiffening? 	

Fragende Negation Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
could I not stiffen?
could you not stiffen?
could she not stiffen?
could we not stiffen?
could you not stiffen?
could they not stiffen? 	could I not be stiffening?
could you not be stiffening?
could she not be stiffening?
could we not be stiffening?
could you not be stiffening?
could they not be stiffening? 	could I not have stiffened?
could you not have stiffened?
could she not have stiffened?
could we not have stiffened?
could you not have stiffened?
could they not have stiffened? 	could I not have been stiffening?
could you not have been stiffening?
could she not have been stiffening?
could we not have been stiffening?
could you not have been stiffening?
could they not have been stiffening?