ought to stifle
Regular verb: stifle - stifled- stifled

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