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