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