Verbo regular: sift - sifted - sifted
Forma simple | Forma con V-ing |
I could sift you could sift he could sift we could sift you could sift they could sift | I could be sifting you could be sifting he could be sifting we could be sifting you could be sifting they could be sifting |
Perfecto | Perfecto con V-ing |
I could have sifted you could have sifted he could have sifted we could have sifted you could have sifted they could have sifted | I could have been sifting you could have been sifting he could have been sifting we could have been sifting you could have been sifting they could have been sifting |
Forma simple | Forma con V-ing |
I couldn't sift you couldn't sift he couldn't sift we couldn't sift you couldn't sift they couldn't sift | I couldn't be sifting you couldn't be sifting he couldn't be sifting we couldn't be sifting you couldn't be sifting they couldn't be sifting |
Perfecto | Perfecto con V-ing |
I couldn't have sifted you couldn't have sifted he couldn't have sifted we couldn't have sifted you couldn't have sifted they couldn't have sifted | I couldn't have been sifting you couldn't have been sifting he couldn't have been sifting we couldn't have been sifting you couldn't have been sifting they couldn't have been sifting |
Forma simple | Forma con V-ing |
could I sift? could you sift? could he sift? could we sift? could you sift? could they sift? | could I be sifting? could you be sifting? could he be sifting? could we be sifting? could you be sifting? could they be sifting? |
Perfecto | Perfecto con V-ing |
could I have sifted? could you have sifted? could he have sifted? could we have sifted? could you have sifted? could they have sifted? | could I have been sifting? could you have been sifting? could he have been sifting? could we have been sifting? could you have been sifting? could they have been sifting? |
Forma simple | Forma con V-ing |
couldn't I sift? couldn't you sift? couldn't he sift? couldn't we sift? couldn't you sift? couldn't they sift? | couldn't I be sifting? couldn't you be sifting? couldn't he be sifting? couldn't we be sifting? couldn't you be sifting? couldn't they be sifting? |
Perfecto | Perfecto con V-ing |
couldn't I have sifted? couldn't you have sifted? couldn't he have sifted? couldn't we have sifted? couldn't you have sifted? couldn't they have sifted? | couldn't I have been sifting? couldn't you have been sifting? couldn't he have been sifting? couldn't we have been sifting? couldn't you have been sifting? couldn't they have been sifting? |