English verb conjugation
MUST OSSIFY

Regular verb: ossify - ossified - ossified

Affirmation

Simple form	V-ing form
I must ossify you must ossify she must ossify we must ossify you must ossify they must ossify	I must be ossifying you must be ossifying she must be ossifying we must be ossifying you must be ossifying they must be ossifying
Perfect	V-ing perfect
I must have ossified you must have ossified she must have ossified we must have ossified you must have ossified they must have ossified	I must have been ossifying you must have been ossifying she must have been ossifying we must have been ossifying you must have been ossifying they must have been ossifying

Negation

Simple form	V-ing form
I mustn't ossify you mustn't ossify she mustn't ossify we mustn't ossify you mustn't ossify they mustn't ossify	I mustn't be ossifying you mustn't be ossifying she mustn't be ossifying we mustn't be ossifying you mustn't be ossifying they mustn't be ossifying
Perfect	V-ing perfect
I mustn't have ossified you mustn't have ossified she mustn't have ossified we mustn't have ossified you mustn't have ossified they mustn't have ossified	I mustn't have been ossifying you mustn't have been ossifying she mustn't have been ossifying we mustn't have been ossifying you mustn't have been ossifying they mustn't have been ossifying

Interrogative form

Simple form	V-ing form
must I ossify? must you ossify? must she ossify? must we ossify? must you ossify? must they ossify?	must I be ossifying? must you be ossifying? must she be ossifying? must we be ossifying? must you be ossifying? must they be ossifying?
Perfect	V-ing perfect
must I have ossified? must you have ossified? must she have ossified? must we have ossified? must you have ossified? must they have ossified?	must I have been ossifying? must you have been ossifying? must she have been ossifying? must we have been ossifying? must you have been ossifying? must they have been ossifying?

Interro-negative form

Simple form	V-ing form
mustn't I ossify? mustn't you ossify? mustn't she ossify? mustn't we ossify? mustn't you ossify? mustn't they ossify?	mustn't I be ossifying? mustn't you be ossifying? mustn't she be ossifying? mustn't we be ossifying? mustn't you be ossifying? mustn't they be ossifying?
Perfect	V-ing perfect
mustn't I have ossified? mustn't you have ossified? mustn't she have ossified? mustn't we have ossified? mustn't you have ossified? mustn't they have ossified?	mustn't I have been ossifying? mustn't you have been ossifying? mustn't she have been ossifying? mustn't we have been ossifying? mustn't you have been ossifying? mustn't they have been ossifying?