ought to sweeten
Regular verb: sweeten - sweetened- sweetened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to sweeten
you ought to sweeten
she ought to sweeten
we ought to sweeten
you ought to sweeten
they ought to sweeten 	I ought to be sweetening
you ought to be sweetening
she ought to be sweetening
we ought to be sweetening
you ought to be sweetening
they ought to be sweetening	I ought to have sweetened
you ought to have sweetened
she ought to have sweetened
we ought to have sweetened
you ought to have sweetened
they ought to have sweetened	I ought to have been sweetening
you ought to have been sweetening
she ought to have been sweetening
we ought to have been sweetening
you ought to have been sweetening
they ought to have been sweetening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I oughtn't to sweeten
you oughtn't to sweeten
she oughtn't to sweeten
we oughtn't to sweeten
you oughtn't to sweeten
they oughtn't to sweeten 	I oughtn't to be sweetening
you oughtn't to be sweetening
she oughtn't to be sweetening
we oughtn't to be sweetening
you oughtn't to be sweetening
they oughtn't to be sweetening	I oughtn't to have sweetened
you oughtn't to have sweetened
she oughtn't to have sweetened
we oughtn't to have sweetened
you oughtn't to have sweetened
they oughtn't to have sweetened	I oughtn't to have been sweetening
you oughtn't to have been sweetening
she oughtn't to have been sweetening
we oughtn't to have been sweetening
you oughtn't to have been sweetening
they oughtn't to have been sweetening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I sweeten?
ought to you sweeten?
ought to she sweeten?
ought to we sweeten?
ought to you sweeten?
ought to they sweeten? 	ought to I be sweetening?
ought to you be sweetening?
ought to she be sweetening?
ought to we be sweetening?
ought to you be sweetening?
ought to they be sweetening? 	ought to I have sweetened?
ought to you have sweetened?
ought to she have sweetened?
ought to we have sweetened?
ought to you have sweetened?
ought to they have sweetened? 	ought to I have been sweetening?
ought to you have been sweetening?
ought to she have been sweetening?
ought to we have been sweetening?
ought to you have been sweetening?
ought to they have been sweetening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to sweeten?
oughtn't you to sweeten?
oughtn't she to sweeten?
oughtn't we to sweeten?
oughtn't you to sweeten?
oughtn't they to sweeten? 	oughtn't I to be sweetening?
oughtn't you to be sweetening?
oughtn't she to be sweetening?
oughtn't we to be sweetening?
oughtn't you to be sweetening?
oughtn't they to be sweetening? 	oughtn't I to have sweetened?
oughtn't you to have sweetened?
oughtn't she to have sweetened?
oughtn't we to have sweetened?
oughtn't you to have sweetened?
oughtn't they to have sweetened? 	oughtn't I to have been sweetening?
oughtn't you to have been sweetening?
oughtn't she to have been sweetening?
oughtn't we to have been sweetening?
oughtn't you to have been sweetening?
oughtn't they to have been sweetening?