ought to back
Regular verb: back - backed- backed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to back
you ought to back
she ought to back
we ought to back
you ought to back
they ought to back 	I ought to be backing
you ought to be backing
she ought to be backing
we ought to be backing
you ought to be backing
they ought to be backing	I ought to have backed
you ought to have backed
she ought to have backed
we ought to have backed
you ought to have backed
they ought to have backed	I ought to have been backing
you ought to have been backing
she ought to have been backing
we ought to have been backing
you ought to have been backing
they ought to have been backing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I oughtn't to back
you oughtn't to back
she oughtn't to back
we oughtn't to back
you oughtn't to back
they oughtn't to back 	I oughtn't to be backing
you oughtn't to be backing
she oughtn't to be backing
we oughtn't to be backing
you oughtn't to be backing
they oughtn't to be backing	I oughtn't to have backed
you oughtn't to have backed
she oughtn't to have backed
we oughtn't to have backed
you oughtn't to have backed
they oughtn't to have backed	I oughtn't to have been backing
you oughtn't to have been backing
she oughtn't to have been backing
we oughtn't to have been backing
you oughtn't to have been backing
they oughtn't to have been backing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I back?
ought to you back?
ought to she back?
ought to we back?
ought to you back?
ought to they back? 	ought to I be backing?
ought to you be backing?
ought to she be backing?
ought to we be backing?
ought to you be backing?
ought to they be backing? 	ought to I have backed?
ought to you have backed?
ought to she have backed?
ought to we have backed?
ought to you have backed?
ought to they have backed? 	ought to I have been backing?
ought to you have been backing?
ought to she have been backing?
ought to we have been backing?
ought to you have been backing?
ought to they have been backing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to back?
oughtn't you to back?
oughtn't she to back?
oughtn't we to back?
oughtn't you to back?
oughtn't they to back? 	oughtn't I to be backing?
oughtn't you to be backing?
oughtn't she to be backing?
oughtn't we to be backing?
oughtn't you to be backing?
oughtn't they to be backing? 	oughtn't I to have backed?
oughtn't you to have backed?
oughtn't she to have backed?
oughtn't we to have backed?
oughtn't you to have backed?
oughtn't they to have backed? 	oughtn't I to have been backing?
oughtn't you to have been backing?
oughtn't she to have been backing?
oughtn't we to have been backing?
oughtn't you to have been backing?
oughtn't they to have been backing?