English verb conjugation
OUGHT TO PREVENT

Regular verb: prevent - prevented - prevented

Affirmation

Simple form	V-ing form
I ought to prevent you ought to prevent he ought to prevent we ought to prevent you ought to prevent they ought to prevent	I ought to be preventing you ought to be preventing he ought to be preventing we ought to be preventing you ought to be preventing they ought to be preventing
Perfect	V-ing perfect
I ought to have prevented you ought to have prevented he ought to have prevented we ought to have prevented you ought to have prevented they ought to have prevented	I ought to have been preventing you ought to have been preventing he ought to have been preventing we ought to have been preventing you ought to have been preventing they ought to have been preventing

Negation

Simple form	V-ing form
I ought not to prevent you ought not to prevent he ought not to prevent we ought not to prevent you ought not to prevent they ought not to prevent	I ought not to preventing you ought not to preventing he ought not to preventing we ought not to preventing you ought not to preventing they ought not to preventing
Perfect	V-ing perfect
I ought not to have prevented you ought not to have prevented he ought not to have prevented we ought not to have prevented you ought not to have prevented they ought not to have prevented	I ought not to have been preventing you ought not to have been preventing he ought not to have been preventing we ought not to have been preventing you ought not to have been preventing they ought not to have been preventing

Interrogative form

Simple form	V-ing form
ought to I prevent? ought to you prevent? ought to he prevent? ought to we prevent? ought to you prevent? ought to they prevent?	ought to I be preventing? ought to you be preventing? ought to he be preventing? ought to we be preventing? ought to you be preventing? ought to they be preventing?
Perfect	V-ing perfect
ought to I have prevented? ought to you have prevented? ought to he have prevented? ought to we have prevented? ought to you have prevented? ought to they have prevented?	ought to I have been preventing? ought to you have been preventing? ought to he have been preventing? ought to we have been preventing? ought to you have been preventing? ought to they have been preventing?

Interro-negative form

Simple form	V-ing form
ought I not to prevent? ought you not to prevent? ought he not to prevent? ought we not to prevent? ought you not to prevent? ought they not to prevent?	ought I not to be preventing? ought you not to be preventing? ought he not to be preventing? ought we not to be preventing? ought you not to be preventing? ought they not to be preventing?
Perfect	V-ing perfect
ought I not to have prevented? ought you not to have prevented? ought he not to have prevented? ought we not to have prevented? ought you not to have prevented? ought they not to have prevented?	ought I not to have been preventing? ought you not to have been preventing? ought he not to have been preventing? ought we not to have been preventing? ought you not to have been preventing? ought they not to have been preventing?