I could sift you could sift she could sift we could sift you could sift they could sift
Forme en V-ing
I could be sifting you could be sifting she could be sifting we could be sifting you could be sifting they could be sifting
Perfect
I could have sifted you could have sifted she could have sifted we could have sifted you could have sifted they could have sifted
Perfect en V-ing
I could have been sifting you could have been sifting she could have been sifting we could have been sifting you could have been sifting they could have been sifting
Négation
Forme simple
I couldn't sift you couldn't sift she couldn't sift we couldn't sift you couldn't sift they couldn't sift
Forme en V-ing
I couldn't be sifting you couldn't be sifting she couldn't be sifting we couldn't be sifting you couldn't be sifting they couldn't be sifting
Perfect
I couldn't have sifted you couldn't have sifted she couldn't have sifted we couldn't have sifted you couldn't have sifted they couldn't have sifted
Perfect en V-ing
I couldn't have been sifting you couldn't have been sifting she couldn't have been sifting we couldn't have been sifting you couldn't have been sifting they couldn't have been sifting
Forme interrogative
Forme simple
could I sift? could you sift? could she sift? could we sift? could you sift? could they sift?
Forme en V-ing
could I be sifting? could you be sifting? could she be sifting? could we be sifting? could you be sifting? could they be sifting?
Perfect
could I have sifted? could you have sifted? could she have sifted? could we have sifted? could you have sifted? could they have sifted?
Perfect en V-ing
could I have been sifting? could you have been sifting? could she have been sifting? could we have been sifting? could you have been sifting? could they have been sifting?
Forme interro-négative
Forme simple
couldn't I sift? couldn't you sift? couldn't she sift? couldn't we sift? couldn't you sift? couldn't they sift?
Forme en V-ing
couldn't I be sifting? couldn't you be sifting? couldn't she be sifting? couldn't we be sifting? couldn't you be sifting? couldn't they be sifting?
Perfect
couldn't I have sifted? couldn't you have sifted? couldn't she have sifted? couldn't we have sifted? couldn't you have sifted? couldn't they have sifted?
Perfect en V-ing
couldn't I have been sifting? couldn't you have been sifting? couldn't she have been sifting? couldn't we have been sifting? couldn't you have been sifting? couldn't they have been sifting?