I may sift you may sift he may sift we may sift you may sift they may sift
V-ing form
I may be sifting you may be sifting he may be sifting we may be sifting you may be sifting they may be sifting
Perfect
I may have sifted you may have sifted he may have sifted we may have sifted you may have sifted they may have sifted
V-ing perfect
I may have been sifting you may have been sifting he may have been sifting we may have been sifting you may have been sifting they may have been sifting
Negation
Simple form
I may not sift you may not sift he may not sift we may not sift you may not sift they may not sift
V-ing form
I may not be sifting you may not be sifting he may not be sifting we may not be sifting you may not be sifting they may not be sifting
Perfect
I may not have sifted you may not have sifted he may not have sifted we may not have sifted you may not have sifted they may not have sifted
V-ing perfect
I may not have been sifting you may not have been sifting he may not have been sifting we may not have been sifting you may not have been sifting they may not have been sifting
Interrogative form
Simple form
may I sift? may you sift? may he sift? may we sift? may you sift? may they sift?
V-ing form
may I be sifting? may you be sifting? may he be sifting? may we be sifting? may you be sifting? may they be sifting?
Perfect
may I have sifted? may you have sifted? may he have sifted? may we have sifted? may you have sifted? may they have sifted?
V-ing perfect
may I have been sifting? may you have been sifting? may he have been sifting? may we have been sifting? may you have been sifting? may they have been sifting?
Interro-negative form
Simple form
may I not sift? may you not sift? may he not sift? may we not sift? may you not sift? may they not sift?
V-ing form
may I not be sifting? may you not be sifting? may he not be sifting? may we not be sifting? may you not be sifting? may they not be sifting?
Perfect
may I not have sifted? may you not have sifted? may he not have sifted? may we not have sifted? may you not have sifted? may they not have sifted?
V-ing perfect
may I not have been sifting? may you not have been sifting? may he not have been sifting? may we not have been sifting? may you not have been sifting? may they not have been sifting?