I could substitute you could substitute she could substitute we could substitute you could substitute they could substitute
Forme en V-ing
I could be substituting you could be substituting she could be substituting we could be substituting you could be substituting they could be substituting
Perfect
I could have substituted you could have substituted she could have substituted we could have substituted you could have substituted they could have substituted
Perfect en V-ing
I could have been substituting you could have been substituting she could have been substituting we could have been substituting you could have been substituting they could have been substituting
Négation
Forme simple
I could not substitute you could not substitute she could not substitute we could not substitute you could not substitute they could not substitute
Forme en V-ing
I could not be substituting you could not be substituting she could not be substituting we could not be substituting you could not be substituting they could not be substituting
Perfect
I could not have substituted you could not have substituted she could not have substituted we could not have substituted you could not have substituted they could not have substituted
Perfect en V-ing
I could not have been substituting you could not have been substituting she could not have been substituting we could not have been substituting you could not have been substituting they could not have been substituting
Forme interrogative
Forme simple
could I substitute? could you substitute? could she substitute? could we substitute? could you substitute? could they substitute?
Forme en V-ing
could I be substituting? could you be substituting? could she be substituting? could we be substituting? could you be substituting? could they be substituting?
Perfect
could I have substituted? could you have substituted? could she have substituted? could we have substituted? could you have substituted? could they have substituted?
Perfect en V-ing
could I have been substituting? could you have been substituting? could she have been substituting? could we have been substituting? could you have been substituting? could they have been substituting?
Forme interro-négative
Forme simple
could I not substitute? could you not substitute? could she not substitute? could we not substitute? could you not substitute? could they not substitute?
Forme en V-ing
could I not be substituting? could you not be substituting? could she not be substituting? could we not be substituting? could you not be substituting? could they not be substituting?
Perfect
could I not have substituted? could you not have substituted? could she not have substituted? could we not have substituted? could you not have substituted? could they not have substituted?
Perfect en V-ing
could I not have been substituting? could you not have been substituting? could she not have been substituting? could we not have been substituting? could you not have been substituting? could they not have been substituting?