English verb conjugation
MIGHT STIFFEN

Regular verb: stiffen - stiffened - stiffened

Affirmation

Simple form	V-ing form
I might stiffen you might stiffen he might stiffen we might stiffen you might stiffen they might stiffen	I might be stiffening you might be stiffening he might be stiffening we might be stiffening you might be stiffening they might be stiffening
Perfect	V-ing perfect
I might have stiffened you might have stiffened he might have stiffened we might have stiffened you might have stiffened they might have stiffened	I might have been stiffening you might have been stiffening he might have been stiffening we might have been stiffening you might have been stiffening they might have been stiffening

Negation

Simple form	V-ing form
I might not stiffen you might not stiffen he might not stiffen we might not stiffen you might not stiffen they might not stiffen	I might not be stiffening you might not be stiffening he might not be stiffening we might not be stiffening you might not be stiffening they might not be stiffening
Perfect	V-ing perfect
I might not have stiffened you might not have stiffened he might not have stiffened we might not have stiffened you might not have stiffened they might not have stiffened	I might not have been stiffening you might not have been stiffening he might not have been stiffening we might not have been stiffening you might not have been stiffening they might not have been stiffening

Interrogative form

Simple form	V-ing form
might I stiffen? might you stiffen? might he stiffen? might we stiffen? might you stiffen? might they stiffen?	might I be stiffening? might you be stiffening? might he be stiffening? might we be stiffening? might you be stiffening? might they be stiffening?
Perfect	V-ing perfect
might I have stiffened? might you have stiffened? might he have stiffened? might we have stiffened? might you have stiffened? might they have stiffened?	might I have been stiffening? might you have been stiffening? might he have been stiffening? might we have been stiffening? might you have been stiffening? might they have been stiffening?

Interro-negative form

Simple form	V-ing form
might I not stiffen? might you not stiffen? might he not stiffen? might we not stiffen? might you not stiffen? might they not stiffen?	might I not be stiffening? might you not be stiffening? might he not be stiffening? might we not be stiffening? might you not be stiffening? might they not be stiffening?
Perfect	V-ing perfect
might I not have stiffened? might you not have stiffened? might he not have stiffened? might we not have stiffened? might you not have stiffened? might they not have stiffened?	might I not have been stiffening? might you not have been stiffening? might he not have been stiffening? might we not have been stiffening? might you not have been stiffening? might they not have been stiffening?