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