I must choose you must choose he must choose we must choose you must choose they must choose
V-ing form
I must be choosing you must be choosing he must be choosing we must be choosing you must be choosing they must be choosing
Perfect
I must have chosen you must have chosen he must have chosen we must have chosen you must have chosen they must have chosen
V-ing perfect
I must have been choosing you must have been choosing he must have been choosing we must have been choosing you must have been choosing they must have been choosing
Negation
Simple form
I mustn't choose you mustn't choose he mustn't choose we mustn't choose you mustn't choose they mustn't choose
V-ing form
I mustn't be choosing you mustn't be choosing he mustn't be choosing we mustn't be choosing you mustn't be choosing they mustn't be choosing
Perfect
I mustn't have chosen you mustn't have chosen he mustn't have chosen we mustn't have chosen you mustn't have chosen they mustn't have chosen
V-ing perfect
I mustn't have been choosing you mustn't have been choosing he mustn't have been choosing we mustn't have been choosing you mustn't have been choosing they mustn't have been choosing
Interrogative form
Simple form
must I choose? must you choose? must he choose? must we choose? must you choose? must they choose?
V-ing form
must I be choosing? must you be choosing? must he be choosing? must we be choosing? must you be choosing? must they be choosing?
Perfect
must I have chosen? must you have chosen? must he have chosen? must we have chosen? must you have chosen? must they have chosen?
V-ing perfect
must I have been choosing? must you have been choosing? must he have been choosing? must we have been choosing? must you have been choosing? must they have been choosing?
Interro-negative form
Simple form
mustn't I choose? mustn't you choose? mustn't he choose? mustn't we choose? mustn't you choose? mustn't they choose?
V-ing form
mustn't I be choosing? mustn't you be choosing? mustn't he be choosing? mustn't we be choosing? mustn't you be choosing? mustn't they be choosing?
Perfect
mustn't I have chosen? mustn't you have chosen? mustn't he have chosen? mustn't we have chosen? mustn't you have chosen? mustn't they have chosen?
V-ing perfect
mustn't I have been choosing? mustn't you have been choosing? mustn't he have been choosing? mustn't we have been choosing? mustn't you have been choosing? mustn't they have been choosing?