English verb conjugation
MUST FORTIFY

Regular verb: fortify - fortified - fortified

Affirmation

Simple form	V-ing form
I must fortify you must fortify he must fortify we must fortify you must fortify they must fortify	I must be fortifying you must be fortifying he must be fortifying we must be fortifying you must be fortifying they must be fortifying
Perfect	V-ing perfect
I must have fortified you must have fortified he must have fortified we must have fortified you must have fortified they must have fortified	I must have been fortifying you must have been fortifying he must have been fortifying we must have been fortifying you must have been fortifying they must have been fortifying

Negation

Simple form	V-ing form
I mustn't fortify you mustn't fortify he mustn't fortify we mustn't fortify you mustn't fortify they mustn't fortify	I mustn't be fortifying you mustn't be fortifying he mustn't be fortifying we mustn't be fortifying you mustn't be fortifying they mustn't be fortifying
Perfect	V-ing perfect
I mustn't have fortified you mustn't have fortified he mustn't have fortified we mustn't have fortified you mustn't have fortified they mustn't have fortified	I mustn't have been fortifying you mustn't have been fortifying he mustn't have been fortifying we mustn't have been fortifying you mustn't have been fortifying they mustn't have been fortifying

Interrogative form

Simple form	V-ing form
must I fortify? must you fortify? must he fortify? must we fortify? must you fortify? must they fortify?	must I be fortifying? must you be fortifying? must he be fortifying? must we be fortifying? must you be fortifying? must they be fortifying?
Perfect	V-ing perfect
must I have fortified? must you have fortified? must he have fortified? must we have fortified? must you have fortified? must they have fortified?	must I have been fortifying? must you have been fortifying? must he have been fortifying? must we have been fortifying? must you have been fortifying? must they have been fortifying?

Interro-negative form

Simple form	V-ing form
mustn't I fortify? mustn't you fortify? mustn't he fortify? mustn't we fortify? mustn't you fortify? mustn't they fortify?	mustn't I be fortifying? mustn't you be fortifying? mustn't he be fortifying? mustn't we be fortifying? mustn't you be fortifying? mustn't they be fortifying?
Perfect	V-ing perfect
mustn't I have fortified? mustn't you have fortified? mustn't he have fortified? mustn't we have fortified? mustn't you have fortified? mustn't they have fortified?	mustn't I have been fortifying? mustn't you have been fortifying? mustn't he have been fortifying? mustn't we have been fortifying? mustn't you have been fortifying? mustn't they have been fortifying?