Conjugación del verbo inglés
SHOULD STIFFEN

Verbo regular: stiffen - stiffened - stiffened

Afirmación

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

Negación

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

Forma interrogativa

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

Forma interro-negativa

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