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 must not choose you must not choose he must not choose we must not choose you must not choose they must not choose
V-ing form
I must not be choosing you must not be choosing he must not be choosing we must not be choosing you must not be choosing they must not be choosing
Perfect
I must not have chosen you must not have chosen he must not have chosen we must not have chosen you must not have chosen they must not have chosen
V-ing perfect
I must not have been choosing you must not have been choosing he must not have been choosing we must not have been choosing you must not have been choosing they must not 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
must I not choose? must you not choose? must he not choose? must we not choose? must you not choose? must they not choose?
V-ing form
must I not be choosing? must you not be choosing? must he not be choosing? must we not be choosing? must you not be choosing? must they not be choosing?
Perfect
must I not have chosen? must you not have chosen? must he not have chosen? must we not have chosen? must you not have chosen? must they not have chosen?
V-ing perfect
must I not have been choosing? must you not have been choosing? must he not have been choosing? must we not have been choosing? must you not have been choosing? must they not have been choosing?