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 mustn't substitute you mustn't substitute he mustn't substitute we mustn't substitute you mustn't substitute they mustn't substitute
Forme en V-ing
I mustn't be substituting you mustn't be substituting he mustn't be substituting we mustn't be substituting you mustn't be substituting they mustn't be substituting
Perfect
I mustn't have substituted you mustn't have substituted he mustn't have substituted we mustn't have substituted you mustn't have substituted they mustn't have substituted
Perfect en V-ing
I mustn't have been substituting you mustn't have been substituting he mustn't have been substituting we mustn't have been substituting you mustn't have been substituting they mustn't 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
mustn't I substitute? mustn't you substitute? mustn't he substitute? mustn't we substitute? mustn't you substitute? mustn't they substitute?
Forme en V-ing
mustn't I be substituting? mustn't you be substituting? mustn't he be substituting? mustn't we be substituting? mustn't you be substituting? mustn't they be substituting?
Perfect
mustn't I have substituted? mustn't you have substituted? mustn't he have substituted? mustn't we have substituted? mustn't you have substituted? mustn't they have substituted?
Perfect en V-ing
mustn't I have been substituting? mustn't you have been substituting? mustn't he have been substituting? mustn't we have been substituting? mustn't you have been substituting? mustn't they have been substituting?