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 must not vitrify
you must not vitrify
she must not vitrify
we must not vitrify
you must not vitrify
they must not vitrify 	I must not be vitrifying
you must not be vitrifying
she must not be vitrifying
we must not be vitrifying
you must not be vitrifying
they must not be vitrifying	I must not have vitrified
you must not have vitrified
she must not have vitrified
we must not have vitrified
you must not have vitrified
they must not have vitrified	I must not have been vitrifying
you must not have been vitrifying
she must not have been vitrifying
we must not have been vitrifying
you must not have been vitrifying
they must not 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 	
must I not vitrify?
must you not vitrify?
must she not vitrify?
must we not vitrify?
must you not vitrify?
must they not vitrify? 	must I not be vitrifying?
must you not be vitrifying?
must she not be vitrifying?
must we not be vitrifying?
must you not be vitrifying?
must they not be vitrifying? 	must I not have vitrified?
must you not have vitrified?
must she not have vitrified?
must we not have vitrified?
must you not have vitrified?
must they not have vitrified? 	must I not have been vitrifying?
must you not have been vitrifying?
must she not have been vitrifying?
must we not have been vitrifying?
must you not have been vitrifying?
must they not have been vitrifying?