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