English verb conjugation
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Regular verb: versify - versified - versified

Affirmation

Simple form	V-ing form
I must versify you must versify he must versify we must versify you must versify they must versify	I must be versifying you must be versifying he must be versifying we must be versifying you must be versifying they must be versifying
Perfect	V-ing perfect
I must have versified you must have versified he must have versified we must have versified you must have versified they must have versified	I must have been versifying you must have been versifying he must have been versifying we must have been versifying you must have been versifying they must have been versifying

Negation

Simple form	V-ing form
I mustn't versify you mustn't versify he mustn't versify we mustn't versify you mustn't versify they mustn't versify	I mustn't be versifying you mustn't be versifying he mustn't be versifying we mustn't be versifying you mustn't be versifying they mustn't be versifying
Perfect	V-ing perfect
I mustn't have versified you mustn't have versified he mustn't have versified we mustn't have versified you mustn't have versified they mustn't have versified	I mustn't have been versifying you mustn't have been versifying he mustn't have been versifying we mustn't have been versifying you mustn't have been versifying they mustn't have been versifying

Interrogative form

Simple form	V-ing form
must I versify? must you versify? must he versify? must we versify? must you versify? must they versify?	must I be versifying? must you be versifying? must he be versifying? must we be versifying? must you be versifying? must they be versifying?
Perfect	V-ing perfect
must I have versified? must you have versified? must he have versified? must we have versified? must you have versified? must they have versified?	must I have been versifying? must you have been versifying? must he have been versifying? must we have been versifying? must you have been versifying? must they have been versifying?

Interro-negative form

Simple form	V-ing form
mustn't I versify? mustn't you versify? mustn't he versify? mustn't we versify? mustn't you versify? mustn't they versify?	mustn't I be versifying? mustn't you be versifying? mustn't he be versifying? mustn't we be versifying? mustn't you be versifying? mustn't they be versifying?
Perfect	V-ing perfect
mustn't I have versified? mustn't you have versified? mustn't he have versified? mustn't we have versified? mustn't you have versified? mustn't they have versified?	mustn't I have been versifying? mustn't you have been versifying? mustn't he have been versifying? mustn't we have been versifying? mustn't you have been versifying? mustn't they have been versifying?