English verb conjugation
MUST RETESTIFY

Regular verb: retestify - retestified - retestified

Affirmation

Simple form	V-ing form
I must retestify you must retestify he must retestify we must retestify you must retestify they must retestify	I must be retestifying you must be retestifying he must be retestifying we must be retestifying you must be retestifying they must be retestifying
Perfect	V-ing perfect
I must have retestified you must have retestified he must have retestified we must have retestified you must have retestified they must have retestified	I must have been retestifying you must have been retestifying he must have been retestifying we must have been retestifying you must have been retestifying they must have been retestifying

Negation

Simple form	V-ing form
I mustn't retestify you mustn't retestify he mustn't retestify we mustn't retestify you mustn't retestify they mustn't retestify	I mustn't be retestifying you mustn't be retestifying he mustn't be retestifying we mustn't be retestifying you mustn't be retestifying they mustn't be retestifying
Perfect	V-ing perfect
I mustn't have retestified you mustn't have retestified he mustn't have retestified we mustn't have retestified you mustn't have retestified they mustn't have retestified	I mustn't have been retestifying you mustn't have been retestifying he mustn't have been retestifying we mustn't have been retestifying you mustn't have been retestifying they mustn't have been retestifying

Interrogative form

Simple form	V-ing form
must I retestify? must you retestify? must he retestify? must we retestify? must you retestify? must they retestify?	must I be retestifying? must you be retestifying? must he be retestifying? must we be retestifying? must you be retestifying? must they be retestifying?
Perfect	V-ing perfect
must I have retestified? must you have retestified? must he have retestified? must we have retestified? must you have retestified? must they have retestified?	must I have been retestifying? must you have been retestifying? must he have been retestifying? must we have been retestifying? must you have been retestifying? must they have been retestifying?

Interro-negative form

Simple form	V-ing form
mustn't I retestify? mustn't you retestify? mustn't he retestify? mustn't we retestify? mustn't you retestify? mustn't they retestify?	mustn't I be retestifying? mustn't you be retestifying? mustn't he be retestifying? mustn't we be retestifying? mustn't you be retestifying? mustn't they be retestifying?
Perfect	V-ing perfect
mustn't I have retestified? mustn't you have retestified? mustn't he have retestified? mustn't we have retestified? mustn't you have retestified? mustn't they have retestified?	mustn't I have been retestifying? mustn't you have been retestifying? mustn't he have been retestifying? mustn't we have been retestifying? mustn't you have been retestifying? mustn't they have been retestifying?