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

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

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

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

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