I must frustrate you must frustrate she must frustrate we must frustrate you must frustrate they must frustrate
Forme en V-ing
I must be frustrating you must be frustrating she must be frustrating we must be frustrating you must be frustrating they must be frustrating
Perfect
I must have frustrated you must have frustrated she must have frustrated we must have frustrated you must have frustrated they must have frustrated
Perfect en V-ing
I must have been frustrating you must have been frustrating she must have been frustrating we must have been frustrating you must have been frustrating they must have been frustrating
Négation
Forme simple
I mustn't frustrate you mustn't frustrate she mustn't frustrate we mustn't frustrate you mustn't frustrate they mustn't frustrate
Forme en V-ing
I mustn't be frustrating you mustn't be frustrating she mustn't be frustrating we mustn't be frustrating you mustn't be frustrating they mustn't be frustrating
Perfect
I mustn't have frustrated you mustn't have frustrated she mustn't have frustrated we mustn't have frustrated you mustn't have frustrated they mustn't have frustrated
Perfect en V-ing
I mustn't have been frustrating you mustn't have been frustrating she mustn't have been frustrating we mustn't have been frustrating you mustn't have been frustrating they mustn't have been frustrating
Forme interrogative
Forme simple
must I frustrate? must you frustrate? must she frustrate? must we frustrate? must you frustrate? must they frustrate?
Forme en V-ing
must I be frustrating? must you be frustrating? must she be frustrating? must we be frustrating? must you be frustrating? must they be frustrating?
Perfect
must I have frustrated? must you have frustrated? must she have frustrated? must we have frustrated? must you have frustrated? must they have frustrated?
Perfect en V-ing
must I have been frustrating? must you have been frustrating? must she have been frustrating? must we have been frustrating? must you have been frustrating? must they have been frustrating?
Forme interro-négative
Forme simple
mustn't I frustrate? mustn't you frustrate? mustn't she frustrate? mustn't we frustrate? mustn't you frustrate? mustn't they frustrate?
Forme en V-ing
mustn't I be frustrating? mustn't you be frustrating? mustn't she be frustrating? mustn't we be frustrating? mustn't you be frustrating? mustn't they be frustrating?
Perfect
mustn't I have frustrated? mustn't you have frustrated? mustn't she have frustrated? mustn't we have frustrated? mustn't you have frustrated? mustn't they have frustrated?
Perfect en V-ing
mustn't I have been frustrating? mustn't you have been frustrating? mustn't she have been frustrating? mustn't we have been frustrating? mustn't you have been frustrating? mustn't they have been frustrating?