must enable
Regular verb: enable - enabled- enabled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must enable
you must enable
he must enable
we must enable
you must enable
they must enable 	I must be enabling
you must be enabling
he must be enabling
we must be enabling
you must be enabling
they must be enabling	I must have enabled
you must have enabled
he must have enabled
we must have enabled
you must have enabled
they must have enabled	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 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't enable
you mustn't enable
he mustn't enable
we mustn't enable
you mustn't enable
they mustn't enable 	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	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	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 	V-ing form 	Perfect 	V-ing perfect 	
must I enable?
must you enable?
must he enable?
must we enable?
must you enable?
must they enable? 	must I be enabling?
must you be enabling?
must he be enabling?
must we be enabling?
must you be enabling?
must they be enabling? 	must I have enabled?
must you have enabled?
must he have enabled?
must we have enabled?
must you have enabled?
must they have enabled? 	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 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I enable?
mustn't you enable?
mustn't he enable?
mustn't we enable?
mustn't you enable?
mustn't they enable? 	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? 	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? 	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?