English verb conjugation
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Regular verb: declare - declared - declared

Affirmation

Simple form	V-ing form
I must declare you must declare she must declare we must declare you must declare they must declare	I must be declaring you must be declaring she 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 she 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 she 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 she 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 she 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 she 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 she 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 she declare? must we declare? must you declare? must they declare?	must I be declaring? must you be declaring? must she 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 she 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 she 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 she 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 she 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 she 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 she have been declaring? mustn't we have been declaring? mustn't you have been declaring? mustn't they have been declaring?