ought to preharden
Regular verb: preharden - prehardened- prehardened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to preharden
you ought to preharden
he ought to preharden
we ought to preharden
you ought to preharden
they ought to preharden 	I ought to be prehardening
you ought to be prehardening
he ought to be prehardening
we ought to be prehardening
you ought to be prehardening
they ought to be prehardening	I ought to have prehardened
you ought to have prehardened
he ought to have prehardened
we ought to have prehardened
you ought to have prehardened
they ought to have prehardened	I ought to have been prehardening
you ought to have been prehardening
he ought to have been prehardening
we ought to have been prehardening
you ought to have been prehardening
they ought to have been prehardening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I oughtn't to preharden
you oughtn't to preharden
he oughtn't to preharden
we oughtn't to preharden
you oughtn't to preharden
they oughtn't to preharden 	I oughtn't to be prehardening
you oughtn't to be prehardening
he oughtn't to be prehardening
we oughtn't to be prehardening
you oughtn't to be prehardening
they oughtn't to be prehardening	I oughtn't to have prehardened
you oughtn't to have prehardened
he oughtn't to have prehardened
we oughtn't to have prehardened
you oughtn't to have prehardened
they oughtn't to have prehardened	I oughtn't to have been prehardening
you oughtn't to have been prehardening
he oughtn't to have been prehardening
we oughtn't to have been prehardening
you oughtn't to have been prehardening
they oughtn't to have been prehardening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I preharden?
ought to you preharden?
ought to he preharden?
ought to we preharden?
ought to you preharden?
ought to they preharden? 	ought to I be prehardening?
ought to you be prehardening?
ought to he be prehardening?
ought to we be prehardening?
ought to you be prehardening?
ought to they be prehardening? 	ought to I have prehardened?
ought to you have prehardened?
ought to he have prehardened?
ought to we have prehardened?
ought to you have prehardened?
ought to they have prehardened? 	ought to I have been prehardening?
ought to you have been prehardening?
ought to he have been prehardening?
ought to we have been prehardening?
ought to you have been prehardening?
ought to they have been prehardening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to preharden?
oughtn't you to preharden?
oughtn't he to preharden?
oughtn't we to preharden?
oughtn't you to preharden?
oughtn't they to preharden? 	oughtn't I to be prehardening?
oughtn't you to be prehardening?
oughtn't he to be prehardening?
oughtn't we to be prehardening?
oughtn't you to be prehardening?
oughtn't they to be prehardening? 	oughtn't I to have prehardened?
oughtn't you to have prehardened?
oughtn't he to have prehardened?
oughtn't we to have prehardened?
oughtn't you to have prehardened?
oughtn't they to have prehardened? 	oughtn't I to have been prehardening?
oughtn't you to have been prehardening?
oughtn't he to have been prehardening?
oughtn't we to have been prehardening?
oughtn't you to have been prehardening?
oughtn't they to have been prehardening?