English verb conjugation
OUGHT TO PURCHASE

Regular verb: purchase - purchased - purchased

Affirmation

Simple form	V-ing form
I ought to purchase you ought to purchase he ought to purchase we ought to purchase you ought to purchase they ought to purchase	I ought to be purchasing you ought to be purchasing he ought to be purchasing we ought to be purchasing you ought to be purchasing they ought to be purchasing
Perfect	V-ing perfect
I ought to have purchased you ought to have purchased he ought to have purchased we ought to have purchased you ought to have purchased they ought to have purchased	I ought to have been purchasing you ought to have been purchasing he ought to have been purchasing we ought to have been purchasing you ought to have been purchasing they ought to have been purchasing

Negation

Simple form	V-ing form
I oughtn't to purchase you oughtn't to purchase he oughtn't to purchase we oughtn't to purchase you oughtn't to purchase they oughtn't to purchase	I oughtn't to be purchasing you oughtn't to be purchasing he oughtn't to be purchasing we oughtn't to be purchasing you oughtn't to be purchasing they oughtn't to be purchasing
Perfect	V-ing perfect
I oughtn't to have purchased you oughtn't to have purchased he oughtn't to have purchased we oughtn't to have purchased you oughtn't to have purchased they oughtn't to have purchased	I oughtn't to have been purchasing you oughtn't to have been purchasing he oughtn't to have been purchasing we oughtn't to have been purchasing you oughtn't to have been purchasing they oughtn't to have been purchasing

Interrogative form

Simple form	V-ing form
ought to I purchase? ought to you purchase? ought to he purchase? ought to we purchase? ought to you purchase? ought to they purchase?	ought to I be purchasing? ought to you be purchasing? ought to he be purchasing? ought to we be purchasing? ought to you be purchasing? ought to they be purchasing?
Perfect	V-ing perfect
ought to I have purchased? ought to you have purchased? ought to he have purchased? ought to we have purchased? ought to you have purchased? ought to they have purchased?	ought to I have been purchasing? ought to you have been purchasing? ought to he have been purchasing? ought to we have been purchasing? ought to you have been purchasing? ought to they have been purchasing?

Interro-negative form

Simple form	V-ing form
oughtn't I to purchase? oughtn't you to purchase? oughtn't he to purchase? oughtn't we to purchase? oughtn't you to purchase? oughtn't they to purchase?	oughtn't I to be purchasing? oughtn't you to be purchasing? oughtn't he to be purchasing? oughtn't we to be purchasing? oughtn't you to be purchasing? oughtn't they to be purchasing?
Perfect	V-ing perfect
oughtn't I to have purchased? oughtn't you to have purchased? oughtn't he to have purchased? oughtn't we to have purchased? oughtn't you to have purchased? oughtn't they to have purchased?	oughtn't I to have been purchasing? oughtn't you to have been purchasing? oughtn't he to have been purchasing? oughtn't we to have been purchasing? oughtn't you to have been purchasing? oughtn't they to have been purchasing?