will stiffen
Verbo regular: stiffen - stiffened- stiffened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I will stiffen
you will stiffen
she will stiffen
we will stiffen
you will stiffen
they will stiffen 	I will be stiffening
you will be stiffening
she will be stiffening
we will be stiffening
you will be stiffening
they will be stiffening	I will have stiffened
you will have stiffened
she will have stiffened
we will have stiffened
you will have stiffened
they will have stiffened	I will have been stiffening
you will have been stiffening
she will have been stiffening
we will have been stiffening
you will have been stiffening
they will have been stiffening	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I will not stiffen
you will not stiffen
she will not stiffen
we will not stiffen
you will not stiffen
they will not stiffen 	I will not be stiffening
you will not be stiffening
she will not be stiffening
we will not be stiffening
you will not be stiffening
they will not be stiffening	I will not have stiffened
you will not have stiffened
she will not have stiffened
we will not have stiffened
you will not have stiffened
they will not have stiffened	I will not have been stiffening
you will not have been stiffening
she will not have been stiffening
we will not have been stiffening
you will not have been stiffening
they will not have been stiffening	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
will I stiffen?
will you stiffen?
will she stiffen?
will we stiffen?
will you stiffen?
will they stiffen? 	will I be stiffening?
will you be stiffening?
will she be stiffening?
will we be stiffening?
will you be stiffening?
will they be stiffening? 	will I have stiffened?
will you have stiffened?
will she have stiffened?
will we have stiffened?
will you have stiffened?
will they have stiffened? 	will I have been stiffening?
will you have been stiffening?
will she have been stiffening?
will we have been stiffening?
will you have been stiffening?
will they have been stiffening? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
will I not stiffen?
will you not stiffen?
will she not stiffen?
will we not stiffen?
will you not stiffen?
will they not stiffen? 	will I not be stiffening?
will you not be stiffening?
will she not be stiffening?
will we not be stiffening?
will you not be stiffening?
will they not be stiffening? 	will I not have stiffened?
will you not have stiffened?
will she not have stiffened?
will we not have stiffened?
will you not have stiffened?
will they not have stiffened? 	will I not have been stiffening?
will you not have been stiffening?
will she not have been stiffening?
will we not have been stiffening?
will you not have been stiffening?
will they not have been stiffening?