ought to purchase
Regular verb: purchase - purchased- purchased

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?