English verb conjugation
MUST BE

Irregular verb: be - was/were - been

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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