ought to rarefy
Regular verb: rarefy - rarefied- rarefied

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to rarefy
you ought to rarefy
she ought to rarefy
we ought to rarefy
you ought to rarefy
they ought to rarefy 	I ought to be rarefying
you ought to be rarefying
she ought to be rarefying
we ought to be rarefying
you ought to be rarefying
they ought to be rarefying	I ought to have rarefied
you ought to have rarefied
she ought to have rarefied
we ought to have rarefied
you ought to have rarefied
they ought to have rarefied	I ought to have been rarefying
you ought to have been rarefying
she ought to have been rarefying
we ought to have been rarefying
you ought to have been rarefying
they ought to have been rarefying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I oughtn't to rarefy
you oughtn't to rarefy
she oughtn't to rarefy
we oughtn't to rarefy
you oughtn't to rarefy
they oughtn't to rarefy 	I oughtn't to be rarefying
you oughtn't to be rarefying
she oughtn't to be rarefying
we oughtn't to be rarefying
you oughtn't to be rarefying
they oughtn't to be rarefying	I oughtn't to have rarefied
you oughtn't to have rarefied
she oughtn't to have rarefied
we oughtn't to have rarefied
you oughtn't to have rarefied
they oughtn't to have rarefied	I oughtn't to have been rarefying
you oughtn't to have been rarefying
she oughtn't to have been rarefying
we oughtn't to have been rarefying
you oughtn't to have been rarefying
they oughtn't to have been rarefying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I rarefy?
ought to you rarefy?
ought to she rarefy?
ought to we rarefy?
ought to you rarefy?
ought to they rarefy? 	ought to I be rarefying?
ought to you be rarefying?
ought to she be rarefying?
ought to we be rarefying?
ought to you be rarefying?
ought to they be rarefying? 	ought to I have rarefied?
ought to you have rarefied?
ought to she have rarefied?
ought to we have rarefied?
ought to you have rarefied?
ought to they have rarefied? 	ought to I have been rarefying?
ought to you have been rarefying?
ought to she have been rarefying?
ought to we have been rarefying?
ought to you have been rarefying?
ought to they have been rarefying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to rarefy?
oughtn't you to rarefy?
oughtn't she to rarefy?
oughtn't we to rarefy?
oughtn't you to rarefy?
oughtn't they to rarefy? 	oughtn't I to be rarefying?
oughtn't you to be rarefying?
oughtn't she to be rarefying?
oughtn't we to be rarefying?
oughtn't you to be rarefying?
oughtn't they to be rarefying? 	oughtn't I to have rarefied?
oughtn't you to have rarefied?
oughtn't she to have rarefied?
oughtn't we to have rarefied?
oughtn't you to have rarefied?
oughtn't they to have rarefied? 	oughtn't I to have been rarefying?
oughtn't you to have been rarefying?
oughtn't she to have been rarefying?
oughtn't we to have been rarefying?
oughtn't you to have been rarefying?
oughtn't they to have been rarefying?