ought to preobtain
Regular verb: preobtain - preobtained- preobtained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to preobtain
you ought to preobtain
he ought to preobtain
we ought to preobtain
you ought to preobtain
they ought to preobtain 	I ought to be preobtaining
you ought to be preobtaining
he ought to be preobtaining
we ought to be preobtaining
you ought to be preobtaining
they ought to be preobtaining	I ought to have preobtained
you ought to have preobtained
he ought to have preobtained
we ought to have preobtained
you ought to have preobtained
they ought to have preobtained	I ought to have been preobtaining
you ought to have been preobtaining
he ought to have been preobtaining
we ought to have been preobtaining
you ought to have been preobtaining
they ought to have been preobtaining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought not to preobtain
you ought not to preobtain
he ought not to preobtain
we ought not to preobtain
you ought not to preobtain
they ought not to preobtain 	I ought not to preobtaining
you ought not to preobtaining
he ought not to preobtaining
we ought not to preobtaining
you ought not to preobtaining
they ought not to preobtaining	I ought not to have preobtained
you ought not to have preobtained
he ought not to have preobtained
we ought not to have preobtained
you ought not to have preobtained
they ought not to have preobtained	I ought not to have been preobtaining
you ought not to have been preobtaining
he ought not to have been preobtaining
we ought not to have been preobtaining
you ought not to have been preobtaining
they ought not to have been preobtaining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I preobtain?
ought to you preobtain?
ought to he preobtain?
ought to we preobtain?
ought to you preobtain?
ought to they preobtain? 	ought to I be preobtaining?
ought to you be preobtaining?
ought to he be preobtaining?
ought to we be preobtaining?
ought to you be preobtaining?
ought to they be preobtaining? 	ought to I have preobtained?
ought to you have preobtained?
ought to he have preobtained?
ought to we have preobtained?
ought to you have preobtained?
ought to they have preobtained? 	ought to I have been preobtaining?
ought to you have been preobtaining?
ought to he have been preobtaining?
ought to we have been preobtaining?
ought to you have been preobtaining?
ought to they have been preobtaining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought I not to preobtain?
ought you not to preobtain?
ought he not to preobtain?
ought we not to preobtain?
ought you not to preobtain?
ought they not to preobtain? 	ought I not to be preobtaining?
ought you not to be preobtaining?
ought he not to be preobtaining?
ought we not to be preobtaining?
ought you not to be preobtaining?
ought they not to be preobtaining? 	ought I not to have preobtained?
ought you not to have preobtained?
ought he not to have preobtained?
ought we not to have preobtained?
ought you not to have preobtained?
ought they not to have preobtained? 	ought I not to have been preobtaining?
ought you not to have been preobtaining?
ought he not to have been preobtaining?
ought we not to have been preobtaining?
ought you not to have been preobtaining?
ought they not to have been preobtaining?