English verb conjugation
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Regular verb: zombify - zombified - zombified

Affirmation

Simple form	V-ing form
I must zombify you must zombify she must zombify we must zombify you must zombify they must zombify	I must be zombifying you must be zombifying she must be zombifying we must be zombifying you must be zombifying they must be zombifying
Perfect	V-ing perfect
I must have zombified you must have zombified she must have zombified we must have zombified you must have zombified they must have zombified	I must have been zombifying you must have been zombifying she must have been zombifying we must have been zombifying you must have been zombifying they must have been zombifying

Negation

Simple form	V-ing form
I must not zombify you must not zombify she must not zombify we must not zombify you must not zombify they must not zombify	I must not be zombifying you must not be zombifying she must not be zombifying we must not be zombifying you must not be zombifying they must not be zombifying
Perfect	V-ing perfect
I must not have zombified you must not have zombified she must not have zombified we must not have zombified you must not have zombified they must not have zombified	I must not have been zombifying you must not have been zombifying she must not have been zombifying we must not have been zombifying you must not have been zombifying they must not have been zombifying

Interrogative form

Simple form	V-ing form
must I zombify? must you zombify? must she zombify? must we zombify? must you zombify? must they zombify?	must I be zombifying? must you be zombifying? must she be zombifying? must we be zombifying? must you be zombifying? must they be zombifying?
Perfect	V-ing perfect
must I have zombified? must you have zombified? must she have zombified? must we have zombified? must you have zombified? must they have zombified?	must I have been zombifying? must you have been zombifying? must she have been zombifying? must we have been zombifying? must you have been zombifying? must they have been zombifying?

Interro-negative form

Simple form	V-ing form
must I not zombify? must you not zombify? must she not zombify? must we not zombify? must you not zombify? must they not zombify?	must I not be zombifying? must you not be zombifying? must she not be zombifying? must we not be zombifying? must you not be zombifying? must they not be zombifying?
Perfect	V-ing perfect
must I not have zombified? must you not have zombified? must she not have zombified? must we not have zombified? must you not have zombified? must they not have zombified?	must I not have been zombifying? must you not have been zombifying? must she not have been zombifying? must we not have been zombifying? must you not have been zombifying? must they not have been zombifying?