English verb conjugation
MIGHT STIFFEN

Regular verb: stiffen - stiffened - stiffened

Affirmation

Simple form	V-ing form
I might stiffen you might stiffen she might stiffen we might stiffen you might stiffen they might stiffen	I might be stiffening you might be stiffening she 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 she 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 she 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 mightn't stiffen you mightn't stiffen she mightn't stiffen we mightn't stiffen you mightn't stiffen they mightn't stiffen	I mightn't be stiffening you mightn't be stiffening she mightn't be stiffening we mightn't be stiffening you mightn't be stiffening they mightn't be stiffening
Perfect	V-ing perfect
I mightn't have stiffened you mightn't have stiffened she mightn't have stiffened we mightn't have stiffened you mightn't have stiffened they mightn't have stiffened	I mightn't have been stiffening you mightn't have been stiffening she mightn't have been stiffening we mightn't have been stiffening you mightn't have been stiffening they mightn't have been stiffening

Interrogative form

Simple form	V-ing form
might I stiffen? might you stiffen? might she stiffen? might we stiffen? might you stiffen? might they stiffen?	might I be stiffening? might you be stiffening? might she 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 she 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 she 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
mightn't I stiffen? mightn't you stiffen? mightn't she stiffen? mightn't we stiffen? mightn't you stiffen? mightn't they stiffen?	mightn't I be stiffening? mightn't you be stiffening? mightn't she be stiffening? mightn't we be stiffening? mightn't you be stiffening? mightn't they be stiffening?
Perfect	V-ing perfect
mightn't I have stiffened? mightn't you have stiffened? mightn't she have stiffened? mightn't we have stiffened? mightn't you have stiffened? mightn't they have stiffened?	mightn't I have been stiffening? mightn't you have been stiffening? mightn't she have been stiffening? mightn't we have been stiffening? mightn't you have been stiffening? mightn't they have been stiffening?