English verb conjugation
MUST SPECIFY

Regular verb: specify - specified - specified

Affirmation

Simple form	V-ing form
I must specify you must specify she must specify we must specify you must specify they must specify	I must be specifying you must be specifying she must be specifying we must be specifying you must be specifying they must be specifying
Perfect	V-ing perfect
I must have specified you must have specified she must have specified we must have specified you must have specified they must have specified	I must have been specifying you must have been specifying she must have been specifying we must have been specifying you must have been specifying they must have been specifying

Negation

Simple form	V-ing form
I mustn't specify you mustn't specify she mustn't specify we mustn't specify you mustn't specify they mustn't specify	I mustn't be specifying you mustn't be specifying she mustn't be specifying we mustn't be specifying you mustn't be specifying they mustn't be specifying
Perfect	V-ing perfect
I mustn't have specified you mustn't have specified she mustn't have specified we mustn't have specified you mustn't have specified they mustn't have specified	I mustn't have been specifying you mustn't have been specifying she mustn't have been specifying we mustn't have been specifying you mustn't have been specifying they mustn't have been specifying

Interrogative form

Simple form	V-ing form
must I specify? must you specify? must she specify? must we specify? must you specify? must they specify?	must I be specifying? must you be specifying? must she be specifying? must we be specifying? must you be specifying? must they be specifying?
Perfect	V-ing perfect
must I have specified? must you have specified? must she have specified? must we have specified? must you have specified? must they have specified?	must I have been specifying? must you have been specifying? must she have been specifying? must we have been specifying? must you have been specifying? must they have been specifying?

Interro-negative form

Simple form	V-ing form
mustn't I specify? mustn't you specify? mustn't she specify? mustn't we specify? mustn't you specify? mustn't they specify?	mustn't I be specifying? mustn't you be specifying? mustn't she be specifying? mustn't we be specifying? mustn't you be specifying? mustn't they be specifying?
Perfect	V-ing perfect
mustn't I have specified? mustn't you have specified? mustn't she have specified? mustn't we have specified? mustn't you have specified? mustn't they have specified?	mustn't I have been specifying? mustn't you have been specifying? mustn't she have been specifying? mustn't we have been specifying? mustn't you have been specifying? mustn't they have been specifying?