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