must devitrify
Regular verb: devitrify - devitrified- devitrified

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must devitrify
you must devitrify
he must devitrify
we must devitrify
you must devitrify
they must devitrify 	I must be devitrifying
you must be devitrifying
he must be devitrifying
we must be devitrifying
you must be devitrifying
they must be devitrifying	I must have devitrified
you must have devitrified
he must have devitrified
we must have devitrified
you must have devitrified
they must have devitrified	I must have been devitrifying
you must have been devitrifying
he must have been devitrifying
we must have been devitrifying
you must have been devitrifying
they must have been devitrifying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't devitrify
you mustn't devitrify
he mustn't devitrify
we mustn't devitrify
you mustn't devitrify
they mustn't devitrify 	I mustn't be devitrifying
you mustn't be devitrifying
he mustn't be devitrifying
we mustn't be devitrifying
you mustn't be devitrifying
they mustn't be devitrifying	I mustn't have devitrified
you mustn't have devitrified
he mustn't have devitrified
we mustn't have devitrified
you mustn't have devitrified
they mustn't have devitrified	I mustn't have been devitrifying
you mustn't have been devitrifying
he mustn't have been devitrifying
we mustn't have been devitrifying
you mustn't have been devitrifying
they mustn't have been devitrifying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I devitrify?
must you devitrify?
must he devitrify?
must we devitrify?
must you devitrify?
must they devitrify? 	must I be devitrifying?
must you be devitrifying?
must he be devitrifying?
must we be devitrifying?
must you be devitrifying?
must they be devitrifying? 	must I have devitrified?
must you have devitrified?
must he have devitrified?
must we have devitrified?
must you have devitrified?
must they have devitrified? 	must I have been devitrifying?
must you have been devitrifying?
must he have been devitrifying?
must we have been devitrifying?
must you have been devitrifying?
must they have been devitrifying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I devitrify?
mustn't you devitrify?
mustn't he devitrify?
mustn't we devitrify?
mustn't you devitrify?
mustn't they devitrify? 	mustn't I be devitrifying?
mustn't you be devitrifying?
mustn't he be devitrifying?
mustn't we be devitrifying?
mustn't you be devitrifying?
mustn't they be devitrifying? 	mustn't I have devitrified?
mustn't you have devitrified?
mustn't he have devitrified?
mustn't we have devitrified?
mustn't you have devitrified?
mustn't they have devitrified? 	mustn't I have been devitrifying?
mustn't you have been devitrifying?
mustn't he have been devitrifying?
mustn't we have been devitrifying?
mustn't you have been devitrifying?
mustn't they have been devitrifying?