I must begin you must begin he must begin we must begin you must begin they must begin
Forma con V-ing
I must be beginning you must be beginning he must be beginning we must be beginning you must be beginning they must be beginning
Perfecto
I must have begun you must have begun he must have begun we must have begun you must have begun they must have begun
Perfecto con V-ing
I must have been beginning you must have been beginning he must have been beginning we must have been beginning you must have been beginning they must have been beginning
Negación
Forma simple
I mustn't begin you mustn't begin he mustn't begin we mustn't begin you mustn't begin they mustn't begin
Forma con V-ing
I mustn't be beginning you mustn't be beginning he mustn't be beginning we mustn't be beginning you mustn't be beginning they mustn't be beginning
Perfecto
I mustn't have begun you mustn't have begun he mustn't have begun we mustn't have begun you mustn't have begun they mustn't have begun
Perfecto con V-ing
I mustn't have been beginning you mustn't have been beginning he mustn't have been beginning we mustn't have been beginning you mustn't have been beginning they mustn't have been beginning
Forma interrogativa
Forma simple
must I begin? must you begin? must he begin? must we begin? must you begin? must they begin?
Forma con V-ing
must I be beginning? must you be beginning? must he be beginning? must we be beginning? must you be beginning? must they be beginning?
Perfecto
must I have begun? must you have begun? must he have begun? must we have begun? must you have begun? must they have begun?
Perfecto con V-ing
must I have been beginning? must you have been beginning? must he have been beginning? must we have been beginning? must you have been beginning? must they have been beginning?
Forma interro-negativa
Forma simple
mustn't I begin? mustn't you begin? mustn't he begin? mustn't we begin? mustn't you begin? mustn't they begin?
Forma con V-ing
mustn't I be beginning? mustn't you be beginning? mustn't he be beginning? mustn't we be beginning? mustn't you be beginning? mustn't they be beginning?
Perfecto
mustn't I have begun? mustn't you have begun? mustn't he have begun? mustn't we have begun? mustn't you have begun? mustn't they have begun?
Perfecto con V-ing
mustn't I have been beginning? mustn't you have been beginning? mustn't he have been beginning? mustn't we have been beginning? mustn't you have been beginning? mustn't they have been beginning?