English verb conjugation
OUGHT TO STIFLE

Regular verb: stifle - stifled - stifled

Affirmation

Simple form	V-ing form
I ought to stifle you ought to stifle he ought to stifle we ought to stifle you ought to stifle they ought to stifle	I ought to be stifling you ought to be stifling he ought to be stifling we ought to be stifling you ought to be stifling they ought to be stifling
Perfect	V-ing perfect
I ought to have stifled you ought to have stifled he ought to have stifled we ought to have stifled you ought to have stifled they ought to have stifled	I ought to have been stifling you ought to have been stifling he ought to have been stifling we ought to have been stifling you ought to have been stifling they ought to have been stifling

Negation

Simple form	V-ing form
I oughtn't to stifle you oughtn't to stifle he oughtn't to stifle we oughtn't to stifle you oughtn't to stifle they oughtn't to stifle	I oughtn't to be stifling you oughtn't to be stifling he oughtn't to be stifling we oughtn't to be stifling you oughtn't to be stifling they oughtn't to be stifling
Perfect	V-ing perfect
I oughtn't to have stifled you oughtn't to have stifled he oughtn't to have stifled we oughtn't to have stifled you oughtn't to have stifled they oughtn't to have stifled	I oughtn't to have been stifling you oughtn't to have been stifling he oughtn't to have been stifling we oughtn't to have been stifling you oughtn't to have been stifling they oughtn't to have been stifling

Interrogative form

Simple form	V-ing form
ought to I stifle? ought to you stifle? ought to he stifle? ought to we stifle? ought to you stifle? ought to they stifle?	ought to I be stifling? ought to you be stifling? ought to he be stifling? ought to we be stifling? ought to you be stifling? ought to they be stifling?
Perfect	V-ing perfect
ought to I have stifled? ought to you have stifled? ought to he have stifled? ought to we have stifled? ought to you have stifled? ought to they have stifled?	ought to I have been stifling? ought to you have been stifling? ought to he have been stifling? ought to we have been stifling? ought to you have been stifling? ought to they have been stifling?

Interro-negative form

Simple form	V-ing form
oughtn't I to stifle? oughtn't you to stifle? oughtn't he to stifle? oughtn't we to stifle? oughtn't you to stifle? oughtn't they to stifle?	oughtn't I to be stifling? oughtn't you to be stifling? oughtn't he to be stifling? oughtn't we to be stifling? oughtn't you to be stifling? oughtn't they to be stifling?
Perfect	V-ing perfect
oughtn't I to have stifled? oughtn't you to have stifled? oughtn't he to have stifled? oughtn't we to have stifled? oughtn't you to have stifled? oughtn't they to have stifled?	oughtn't I to have been stifling? oughtn't you to have been stifling? oughtn't he to have been stifling? oughtn't we to have been stifling? oughtn't you to have been stifling? oughtn't they to have been stifling?