ought to whiten
Regular verb: whiten - whitened- whitened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to whiten
you ought to whiten
he ought to whiten
we ought to whiten
you ought to whiten
they ought to whiten 	I ought to be whitening
you ought to be whitening
he ought to be whitening
we ought to be whitening
you ought to be whitening
they ought to be whitening	I ought to have whitened
you ought to have whitened
he ought to have whitened
we ought to have whitened
you ought to have whitened
they ought to have whitened	I ought to have been whitening
you ought to have been whitening
he ought to have been whitening
we ought to have been whitening
you ought to have been whitening
they ought to have been whitening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I oughtn't to whiten
you oughtn't to whiten
he oughtn't to whiten
we oughtn't to whiten
you oughtn't to whiten
they oughtn't to whiten 	I oughtn't to be whitening
you oughtn't to be whitening
he oughtn't to be whitening
we oughtn't to be whitening
you oughtn't to be whitening
they oughtn't to be whitening	I oughtn't to have whitened
you oughtn't to have whitened
he oughtn't to have whitened
we oughtn't to have whitened
you oughtn't to have whitened
they oughtn't to have whitened	I oughtn't to have been whitening
you oughtn't to have been whitening
he oughtn't to have been whitening
we oughtn't to have been whitening
you oughtn't to have been whitening
they oughtn't to have been whitening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I whiten?
ought to you whiten?
ought to he whiten?
ought to we whiten?
ought to you whiten?
ought to they whiten? 	ought to I be whitening?
ought to you be whitening?
ought to he be whitening?
ought to we be whitening?
ought to you be whitening?
ought to they be whitening? 	ought to I have whitened?
ought to you have whitened?
ought to he have whitened?
ought to we have whitened?
ought to you have whitened?
ought to they have whitened? 	ought to I have been whitening?
ought to you have been whitening?
ought to he have been whitening?
ought to we have been whitening?
ought to you have been whitening?
ought to they have been whitening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to whiten?
oughtn't you to whiten?
oughtn't he to whiten?
oughtn't we to whiten?
oughtn't you to whiten?
oughtn't they to whiten? 	oughtn't I to be whitening?
oughtn't you to be whitening?
oughtn't he to be whitening?
oughtn't we to be whitening?
oughtn't you to be whitening?
oughtn't they to be whitening? 	oughtn't I to have whitened?
oughtn't you to have whitened?
oughtn't he to have whitened?
oughtn't we to have whitened?
oughtn't you to have whitened?
oughtn't they to have whitened? 	oughtn't I to have been whitening?
oughtn't you to have been whitening?
oughtn't he to have been whitening?
oughtn't we to have been whitening?
oughtn't you to have been whitening?
oughtn't they to have been whitening?