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
she 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
she 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
she 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
she 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 ought not to blacken
you ought not to blacken
she ought not to blacken
we ought not to blacken
you ought not to blacken
they ought not to blacken 	I ought not to blackening
you ought not to blackening
she ought not to blackening
we ought not to blackening
you ought not to blackening
they ought not to blackening	I ought not to have blackened
you ought not to have blackened
she ought not to have blackened
we ought not to have blackened
you ought not to have blackened
they ought not to have blackened	I ought not to have been blackening
you ought not to have been blackening
she ought not to have been blackening
we ought not to have been blackening
you ought not to have been blackening
they ought not 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 she 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 she 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 she 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 she 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 	
ought I not to blacken?
ought you not to blacken?
ought she not to blacken?
ought we not to blacken?
ought you not to blacken?
ought they not to blacken? 	ought I not to be blackening?
ought you not to be blackening?
ought she not to be blackening?
ought we not to be blackening?
ought you not to be blackening?
ought they not to be blackening? 	ought I not to have blackened?
ought you not to have blackened?
ought she not to have blackened?
ought we not to have blackened?
ought you not to have blackened?
ought they not to have blackened? 	ought I not to have been blackening?
ought you not to have been blackening?
ought she not to have been blackening?
ought we not to have been blackening?
ought you not to have been blackening?
ought they not to have been blackening?