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 mustn't zombify you mustn't zombify she mustn't zombify we mustn't zombify you mustn't zombify they mustn't zombify	I mustn't be zombifying you mustn't be zombifying she mustn't be zombifying we mustn't be zombifying you mustn't be zombifying they mustn't be zombifying
Perfect	V-ing perfect
I mustn't have zombified you mustn't have zombified she mustn't have zombified we mustn't have zombified you mustn't have zombified they mustn't have zombified	I mustn't have been zombifying you mustn't have been zombifying she mustn't have been zombifying we mustn't have been zombifying you mustn't have been zombifying they mustn't 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
mustn't I zombify? mustn't you zombify? mustn't she zombify? mustn't we zombify? mustn't you zombify? mustn't they zombify?	mustn't I be zombifying? mustn't you be zombifying? mustn't she be zombifying? mustn't we be zombifying? mustn't you be zombifying? mustn't they be zombifying?
Perfect	V-ing perfect
mustn't I have zombified? mustn't you have zombified? mustn't she have zombified? mustn't we have zombified? mustn't you have zombified? mustn't they have zombified?	mustn't I have been zombifying? mustn't you have been zombifying? mustn't she have been zombifying? mustn't we have been zombifying? mustn't you have been zombifying? mustn't they have been zombifying?