English verb conjugation
OUGHT TO STIFFEN

Regular verb: stiffen - stiffened - stiffened

Affirmation

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

Negation

Simple form	V-ing form
I oughtn't to stiffen you oughtn't to stiffen he oughtn't to stiffen we oughtn't to stiffen you oughtn't to stiffen they oughtn't to stiffen	I oughtn't to be stiffening you oughtn't to be stiffening he oughtn't to be stiffening we oughtn't to be stiffening you oughtn't to be stiffening they oughtn't to be stiffening
Perfect	V-ing perfect
I oughtn't to have stiffened you oughtn't to have stiffened he oughtn't to have stiffened we oughtn't to have stiffened you oughtn't to have stiffened they oughtn't to have stiffened	I oughtn't to have been stiffening you oughtn't to have been stiffening he oughtn't to have been stiffening we oughtn't to have been stiffening you oughtn't to have been stiffening they oughtn't to have been stiffening

Interrogative form

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

Interro-negative form

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