I ought to prevent you ought to prevent he ought to prevent we ought to prevent you ought to prevent they ought to prevent
Forme en V-ing
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
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
Perfect en V-ing
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
Négation
Forme simple
I oughtn't to prevent you oughtn't to prevent he oughtn't to prevent we oughtn't to prevent you oughtn't to prevent they oughtn't to prevent
Forme en V-ing
I oughtn't to be preventing you oughtn't to be preventing he oughtn't to be preventing we oughtn't to be preventing you oughtn't to be preventing they oughtn't to be preventing
Perfect
I oughtn't to have prevented you oughtn't to have prevented he oughtn't to have prevented we oughtn't to have prevented you oughtn't to have prevented they oughtn't to have prevented
Perfect en V-ing
I oughtn't to have been preventing you oughtn't to have been preventing he oughtn't to have been preventing we oughtn't to have been preventing you oughtn't to have been preventing they oughtn't to have been preventing
Forme interrogative
Forme simple
ought to I prevent? ought to you prevent? ought to he prevent? ought to we prevent? ought to you prevent? ought to they prevent?
Forme en V-ing
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
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?
Perfect en V-ing
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?
Forme interro-négative
Forme simple
oughtn't I to prevent? oughtn't you to prevent? oughtn't he to prevent? oughtn't we to prevent? oughtn't you to prevent? oughtn't they to prevent?
Forme en V-ing
oughtn't I to be preventing? oughtn't you to be preventing? oughtn't he to be preventing? oughtn't we to be preventing? oughtn't you to be preventing? oughtn't they to be preventing?
Perfect
oughtn't I to have prevented? oughtn't you to have prevented? oughtn't he to have prevented? oughtn't we to have prevented? oughtn't you to have prevented? oughtn't they to have prevented?
Perfect en V-ing
oughtn't I to have been preventing? oughtn't you to have been preventing? oughtn't he to have been preventing? oughtn't we to have been preventing? oughtn't you to have been preventing? oughtn't they to have been preventing?