English verb conjugation
OUGHT TO PREOBTAIN

Regular verb: preobtain - preobtained - preobtained

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I oughtn't to preobtain you oughtn't to preobtain he oughtn't to preobtain we oughtn't to preobtain you oughtn't to preobtain they oughtn't to preobtain	I oughtn't to be preobtaining you oughtn't to be preobtaining he oughtn't to be preobtaining we oughtn't to be preobtaining you oughtn't to be preobtaining they oughtn't to be preobtaining
Perfect	V-ing perfect
I oughtn't to have preobtained you oughtn't to have preobtained he oughtn't to have preobtained we oughtn't to have preobtained you oughtn't to have preobtained they oughtn't to have preobtained	I oughtn't to have been preobtaining you oughtn't to have been preobtaining he oughtn't to have been preobtaining we oughtn't to have been preobtaining you oughtn't to have been preobtaining they oughtn't to have been preobtaining

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
oughtn't I to preobtain? oughtn't you to preobtain? oughtn't he to preobtain? oughtn't we to preobtain? oughtn't you to preobtain? oughtn't they to preobtain?	oughtn't I to be preobtaining? oughtn't you to be preobtaining? oughtn't he to be preobtaining? oughtn't we to be preobtaining? oughtn't you to be preobtaining? oughtn't they to be preobtaining?
Perfect	V-ing perfect
oughtn't I to have preobtained? oughtn't you to have preobtained? oughtn't he to have preobtained? oughtn't we to have preobtained? oughtn't you to have preobtained? oughtn't they to have preobtained?	oughtn't I to have been preobtaining? oughtn't you to have been preobtaining? oughtn't he to have been preobtaining? oughtn't we to have been preobtaining? oughtn't you to have been preobtaining? oughtn't they to have been preobtaining?