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 couldn't stiffen
you couldn't stiffen
she couldn't stiffen
we couldn't stiffen
you couldn't stiffen
they couldn't stiffen 	I couldn't be stiffening
you couldn't be stiffening
she couldn't be stiffening
we couldn't be stiffening
you couldn't be stiffening
they couldn't be stiffening	I couldn't have stiffened
you couldn't have stiffened
she couldn't have stiffened
we couldn't have stiffened
you couldn't have stiffened
they couldn't have stiffened	I couldn't have been stiffening
you couldn't have been stiffening
she couldn't have been stiffening
we couldn't have been stiffening
you couldn't have been stiffening
they couldn't 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 	
couldn't I stiffen?
couldn't you stiffen?
couldn't she stiffen?
couldn't we stiffen?
couldn't you stiffen?
couldn't they stiffen? 	couldn't I be stiffening?
couldn't you be stiffening?
couldn't she be stiffening?
couldn't we be stiffening?
couldn't you be stiffening?
couldn't they be stiffening? 	couldn't I have stiffened?
couldn't you have stiffened?
couldn't she have stiffened?
couldn't we have stiffened?
couldn't you have stiffened?
couldn't they have stiffened? 	couldn't I have been stiffening?
couldn't you have been stiffening?
couldn't she have been stiffening?
couldn't we have been stiffening?
couldn't you have been stiffening?
couldn't they have been stiffening?