ought to blacken
Regular verb: blacken - blackened- blackened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to blacken
you ought to blacken
he ought to blacken
we ought to blacken
you ought to blacken
they ought to blacken 	I ought to be blackening
you ought to be blackening
he ought to be blackening
we ought to be blackening
you ought to be blackening
they ought to be blackening	I ought to have blackened
you ought to have blackened
he ought to have blackened
we ought to have blackened
you ought to have blackened
they ought to have blackened	I ought to have been blackening
you ought to have been blackening
he ought to have been blackening
we ought to have been blackening
you ought to have been blackening
they ought to have been blackening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I oughtn't to blacken
you oughtn't to blacken
he oughtn't to blacken
we oughtn't to blacken
you oughtn't to blacken
they oughtn't to blacken 	I oughtn't to be blackening
you oughtn't to be blackening
he oughtn't to be blackening
we oughtn't to be blackening
you oughtn't to be blackening
they oughtn't to be blackening	I oughtn't to have blackened
you oughtn't to have blackened
he oughtn't to have blackened
we oughtn't to have blackened
you oughtn't to have blackened
they oughtn't to have blackened	I oughtn't to have been blackening
you oughtn't to have been blackening
he oughtn't to have been blackening
we oughtn't to have been blackening
you oughtn't to have been blackening
they oughtn't to have been blackening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I blacken?
ought to you blacken?
ought to he blacken?
ought to we blacken?
ought to you blacken?
ought to they blacken? 	ought to I be blackening?
ought to you be blackening?
ought to he be blackening?
ought to we be blackening?
ought to you be blackening?
ought to they be blackening? 	ought to I have blackened?
ought to you have blackened?
ought to he have blackened?
ought to we have blackened?
ought to you have blackened?
ought to they have blackened? 	ought to I have been blackening?
ought to you have been blackening?
ought to he have been blackening?
ought to we have been blackening?
ought to you have been blackening?
ought to they have been blackening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to blacken?
oughtn't you to blacken?
oughtn't he to blacken?
oughtn't we to blacken?
oughtn't you to blacken?
oughtn't they to blacken? 	oughtn't I to be blackening?
oughtn't you to be blackening?
oughtn't he to be blackening?
oughtn't we to be blackening?
oughtn't you to be blackening?
oughtn't they to be blackening? 	oughtn't I to have blackened?
oughtn't you to have blackened?
oughtn't he to have blackened?
oughtn't we to have blackened?
oughtn't you to have blackened?
oughtn't they to have blackened? 	oughtn't I to have been blackening?
oughtn't you to have been blackening?
oughtn't he to have been blackening?
oughtn't we to have been blackening?
oughtn't you to have been blackening?
oughtn't they to have been blackening?