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
she 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
she 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
she 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
she 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 ought not to purchase
you ought not to purchase
she ought not to purchase
we ought not to purchase
you ought not to purchase
they ought not to purchase 	I ought not to purchasing
you ought not to purchasing
she ought not to purchasing
we ought not to purchasing
you ought not to purchasing
they ought not to purchasing	I ought not to have purchased
you ought not to have purchased
she ought not to have purchased
we ought not to have purchased
you ought not to have purchased
they ought not to have purchased	I ought not to have been purchasing
you ought not to have been purchasing
she ought not to have been purchasing
we ought not to have been purchasing
you ought not to have been purchasing
they ought not 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 she 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 she 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 she 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 she 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 	
ought I not to purchase?
ought you not to purchase?
ought she not to purchase?
ought we not to purchase?
ought you not to purchase?
ought they not to purchase? 	ought I not to be purchasing?
ought you not to be purchasing?
ought she not to be purchasing?
ought we not to be purchasing?
ought you not to be purchasing?
ought they not to be purchasing? 	ought I not to have purchased?
ought you not to have purchased?
ought she not to have purchased?
ought we not to have purchased?
ought you not to have purchased?
ought they not to have purchased? 	ought I not to have been purchasing?
ought you not to have been purchasing?
ought she not to have been purchasing?
ought we not to have been purchasing?
ought you not to have been purchasing?
ought they not to have been purchasing?