I ought to sift you ought to sift she ought to sift we ought to sift you ought to sift they ought to sift
V-ing form
I ought to be sifting you ought to be sifting she ought to be sifting we ought to be sifting you ought to be sifting they ought to be sifting
Perfect
I ought to have sifted you ought to have sifted she ought to have sifted we ought to have sifted you ought to have sifted they ought to have sifted
V-ing perfect
I ought to have been sifting you ought to have been sifting she ought to have been sifting we ought to have been sifting you ought to have been sifting they ought to have been sifting
Negation
Simple form
I oughtn't to sift you oughtn't to sift she oughtn't to sift we oughtn't to sift you oughtn't to sift they oughtn't to sift
V-ing form
I oughtn't to be sifting you oughtn't to be sifting she oughtn't to be sifting we oughtn't to be sifting you oughtn't to be sifting they oughtn't to be sifting
Perfect
I oughtn't to have sifted you oughtn't to have sifted she oughtn't to have sifted we oughtn't to have sifted you oughtn't to have sifted they oughtn't to have sifted
V-ing perfect
I oughtn't to have been sifting you oughtn't to have been sifting she oughtn't to have been sifting we oughtn't to have been sifting you oughtn't to have been sifting they oughtn't to have been sifting
Interrogative form
Simple form
ought to I sift? ought to you sift? ought to she sift? ought to we sift? ought to you sift? ought to they sift?
V-ing form
ought to I be sifting? ought to you be sifting? ought to she be sifting? ought to we be sifting? ought to you be sifting? ought to they be sifting?
Perfect
ought to I have sifted? ought to you have sifted? ought to she have sifted? ought to we have sifted? ought to you have sifted? ought to they have sifted?
V-ing perfect
ought to I have been sifting? ought to you have been sifting? ought to she have been sifting? ought to we have been sifting? ought to you have been sifting? ought to they have been sifting?
Interro-negative form
Simple form
oughtn't I to sift? oughtn't you to sift? oughtn't she to sift? oughtn't we to sift? oughtn't you to sift? oughtn't they to sift?
V-ing form
oughtn't I to be sifting? oughtn't you to be sifting? oughtn't she to be sifting? oughtn't we to be sifting? oughtn't you to be sifting? oughtn't they to be sifting?
Perfect
oughtn't I to have sifted? oughtn't you to have sifted? oughtn't she to have sifted? oughtn't we to have sifted? oughtn't you to have sifted? oughtn't they to have sifted?
V-ing perfect
oughtn't I to have been sifting? oughtn't you to have been sifting? oughtn't she to have been sifting? oughtn't we to have been sifting? oughtn't you to have been sifting? oughtn't they to have been sifting?