English verb conjugation
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Regular verb: declare - declared - declared

Affirmation

Simple form	V-ing form
I must declare you must declare he must declare we must declare you must declare they must declare	I must be declaring you must be declaring he must be declaring we must be declaring you must be declaring they must be declaring
Perfect	V-ing perfect
I must have declared you must have declared he must have declared we must have declared you must have declared they must have declared	I must have been declaring you must have been declaring he must have been declaring we must have been declaring you must have been declaring they must have been declaring

Negation

Simple form	V-ing form
I mustn't declare you mustn't declare he mustn't declare we mustn't declare you mustn't declare they mustn't declare	I mustn't be declaring you mustn't be declaring he mustn't be declaring we mustn't be declaring you mustn't be declaring they mustn't be declaring
Perfect	V-ing perfect
I mustn't have declared you mustn't have declared he mustn't have declared we mustn't have declared you mustn't have declared they mustn't have declared	I mustn't have been declaring you mustn't have been declaring he mustn't have been declaring we mustn't have been declaring you mustn't have been declaring they mustn't have been declaring

Interrogative form

Simple form	V-ing form
must I declare? must you declare? must he declare? must we declare? must you declare? must they declare?	must I be declaring? must you be declaring? must he be declaring? must we be declaring? must you be declaring? must they be declaring?
Perfect	V-ing perfect
must I have declared? must you have declared? must he have declared? must we have declared? must you have declared? must they have declared?	must I have been declaring? must you have been declaring? must he have been declaring? must we have been declaring? must you have been declaring? must they have been declaring?

Interro-negative form

Simple form	V-ing form
mustn't I declare? mustn't you declare? mustn't he declare? mustn't we declare? mustn't you declare? mustn't they declare?	mustn't I be declaring? mustn't you be declaring? mustn't he be declaring? mustn't we be declaring? mustn't you be declaring? mustn't they be declaring?
Perfect	V-ing perfect
mustn't I have declared? mustn't you have declared? mustn't he have declared? mustn't we have declared? mustn't you have declared? mustn't they have declared?	mustn't I have been declaring? mustn't you have been declaring? mustn't he have been declaring? mustn't we have been declaring? mustn't you have been declaring? mustn't they have been declaring?