English verb conjugation
MUST VITRIFY

Regular verb: vitrify - vitrified - vitrified

Affirmation

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