must devocalize
Regular verb: devocalize - devocalized- devocalized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must devocalize
you must devocalize
he must devocalize
we must devocalize
you must devocalize
they must devocalize 	I must be devocalizing
you must be devocalizing
he must be devocalizing
we must be devocalizing
you must be devocalizing
they must be devocalizing	I must have devocalized
you must have devocalized
he must have devocalized
we must have devocalized
you must have devocalized
they must have devocalized	I must have been devocalizing
you must have been devocalizing
he must have been devocalizing
we must have been devocalizing
you must have been devocalizing
they must have been devocalizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't devocalize
you mustn't devocalize
he mustn't devocalize
we mustn't devocalize
you mustn't devocalize
they mustn't devocalize 	I mustn't be devocalizing
you mustn't be devocalizing
he mustn't be devocalizing
we mustn't be devocalizing
you mustn't be devocalizing
they mustn't be devocalizing	I mustn't have devocalized
you mustn't have devocalized
he mustn't have devocalized
we mustn't have devocalized
you mustn't have devocalized
they mustn't have devocalized	I mustn't have been devocalizing
you mustn't have been devocalizing
he mustn't have been devocalizing
we mustn't have been devocalizing
you mustn't have been devocalizing
they mustn't have been devocalizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I devocalize?
must you devocalize?
must he devocalize?
must we devocalize?
must you devocalize?
must they devocalize? 	must I be devocalizing?
must you be devocalizing?
must he be devocalizing?
must we be devocalizing?
must you be devocalizing?
must they be devocalizing? 	must I have devocalized?
must you have devocalized?
must he have devocalized?
must we have devocalized?
must you have devocalized?
must they have devocalized? 	must I have been devocalizing?
must you have been devocalizing?
must he have been devocalizing?
must we have been devocalizing?
must you have been devocalizing?
must they have been devocalizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I devocalize?
mustn't you devocalize?
mustn't he devocalize?
mustn't we devocalize?
mustn't you devocalize?
mustn't they devocalize? 	mustn't I be devocalizing?
mustn't you be devocalizing?
mustn't he be devocalizing?
mustn't we be devocalizing?
mustn't you be devocalizing?
mustn't they be devocalizing? 	mustn't I have devocalized?
mustn't you have devocalized?
mustn't he have devocalized?
mustn't we have devocalized?
mustn't you have devocalized?
mustn't they have devocalized? 	mustn't I have been devocalizing?
mustn't you have been devocalizing?
mustn't he have been devocalizing?
mustn't we have been devocalizing?
mustn't you have been devocalizing?
mustn't they have been devocalizing?