must vitrify
Regular verb: vitrify - vitrified- vitrified

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must vitrify
you must vitrify
she must vitrify
we must vitrify
you must vitrify
they must vitrify 	I must be vitrifying
you must be vitrifying
she must be vitrifying
we must be vitrifying
you must be vitrifying
they must be vitrifying	I must have vitrified
you must have vitrified
she must have vitrified
we must have vitrified
you must have vitrified
they must have vitrified	I must have been vitrifying
you must have been vitrifying
she must have been vitrifying
we must have been vitrifying
you must have been vitrifying
they must have been vitrifying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't vitrify
you mustn't vitrify
she mustn't vitrify
we mustn't vitrify
you mustn't vitrify
they mustn't vitrify 	I mustn't be vitrifying
you mustn't be vitrifying
she mustn't be vitrifying
we mustn't be vitrifying
you mustn't be vitrifying
they mustn't be vitrifying	I mustn't have vitrified
you mustn't have vitrified
she mustn't have vitrified
we mustn't have vitrified
you mustn't have vitrified
they mustn't have vitrified	I mustn't have been vitrifying
you mustn't have been vitrifying
she mustn't have been vitrifying
we mustn't have been vitrifying
you mustn't have been vitrifying
they mustn't have been vitrifying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I vitrify?
must you vitrify?
must she vitrify?
must we vitrify?
must you vitrify?
must they vitrify? 	must I be vitrifying?
must you be vitrifying?
must she be vitrifying?
must we be vitrifying?
must you be vitrifying?
must they be vitrifying? 	must I have vitrified?
must you have vitrified?
must she have vitrified?
must we have vitrified?
must you have vitrified?
must they have vitrified? 	must I have been vitrifying?
must you have been vitrifying?
must she have been vitrifying?
must we have been vitrifying?
must you have been vitrifying?
must they have been vitrifying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I vitrify?
mustn't you vitrify?
mustn't she vitrify?
mustn't we vitrify?
mustn't you vitrify?
mustn't they vitrify? 	mustn't I be vitrifying?
mustn't you be vitrifying?
mustn't she be vitrifying?
mustn't we be vitrifying?
mustn't you be vitrifying?
mustn't they be vitrifying? 	mustn't I have vitrified?
mustn't you have vitrified?
mustn't she have vitrified?
mustn't we have vitrified?
mustn't you have vitrified?
mustn't they have vitrified? 	mustn't I have been vitrifying?
mustn't you have been vitrifying?
mustn't she have been vitrifying?
mustn't we have been vitrifying?
mustn't you have been vitrifying?
mustn't they have been vitrifying?