English verb conjugation MUST BE

Irregular verb: be - was/were - been

Affirmation

Simple form

I must be
you must be
he must be
we must be
you must be
they must be

V-ing form

I must be being
you must be being
he must be being
we must be being
you must be being
they must be being

Perfect

I must have been
you must have been
he must have been
we must have been
you must have been
they must have been

V-ing perfect

I must have been being
you must have been being
he must have been being
we must have been being
you must have been being
they must have been being

Negation

Simple form

I mustn't be
you mustn't be
he mustn't be
we mustn't be
you mustn't be
they mustn't be

V-ing form

I mustn't be being
you mustn't be being
he mustn't be being
we mustn't be being
you mustn't be being
they mustn't be being

Perfect

I mustn't have been
you mustn't have been
he mustn't have been
we mustn't have been
you mustn't have been
they mustn't have been

V-ing perfect

I mustn't have been being
you mustn't have been being
he 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

must I be?
must you be?
must he be?
must we be?
must you be?
must they be?

V-ing form

must I be being?
must you be being?
must he be being?
must we be being?
must you be being?
must they be being?

Perfect

must I have been?
must you have been?
must he have been?
must we have been?
must you have been?
must they have been?

V-ing perfect

must I have been being?
must you have been being?
must he have been being?
must we have been being?
must you have been being?
must they have been being?

Interro-negative form

Simple form

mustn't I be?
mustn't you be?
mustn't he be?
mustn't we be?
mustn't you be?
mustn't they be?

V-ing form

mustn't I be being?
mustn't you be being?
mustn't he be being?
mustn't we be being?
mustn't you be being?
mustn't they be being?

Perfect

mustn't I have been?
mustn't you have been?
mustn't he have been?
mustn't we have been?
mustn't you have been?
mustn't they have been?

V-ing perfect

mustn't I have been being?
mustn't you have been being?
mustn't he have been being?
mustn't we have been being?
mustn't you have been being?
mustn't they have been being?

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