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
he will stiffen
we will stiffen
you will stiffen
they will stiffen 	I will be stiffening
you will be stiffening
he will be stiffening
we will be stiffening
you will be stiffening
they will be stiffening	I will have stiffened
you will have stiffened
he 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
he 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
he 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
he 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
he 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
he 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 he stiffen?
will we stiffen?
will you stiffen?
will they stiffen? 	will I be stiffening?
will you be stiffening?
will he be stiffening?
will we be stiffening?
will you be stiffening?
will they be stiffening? 	will I have stiffened?
will you have stiffened?
will he 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 he 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 he 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 he 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 he 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 he not have been stiffening?
will we not have been stiffening?
will you not have been stiffening?
will they not have been stiffening?