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 must not retestify you must not retestify he must not retestify we must not retestify you must not retestify they must not retestify	I must not be retestifying you must not be retestifying he must not be retestifying we must not be retestifying you must not be retestifying they must not be retestifying
Perfect	V-ing perfect
I must not have retestified you must not have retestified he must not have retestified we must not have retestified you must not have retestified they must not have retestified	I must not have been retestifying you must not have been retestifying he must not have been retestifying we must not have been retestifying you must not have been retestifying they must not 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
must I not retestify? must you not retestify? must he not retestify? must we not retestify? must you not retestify? must they not retestify?	must I not be retestifying? must you not be retestifying? must he not be retestifying? must we not be retestifying? must you not be retestifying? must they not be retestifying?
Perfect	V-ing perfect
must I not have retestified? must you not have retestified? must he not have retestified? must we not have retestified? must you not have retestified? must they not have retestified?	must I not have been retestifying? must you not have been retestifying? must he not have been retestifying? must we not have been retestifying? must you not have been retestifying? must they not have been retestifying?