English verb conjugation MUST BRIEF

Regular verb: brief - briefed - briefed

Affirmation

Simple form

I must brief
you must brief
he must brief
we must brief
you must brief
they must brief

V-ing form

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

Perfect

I must have briefed
you must have briefed
he must have briefed
we must have briefed
you must have briefed
they must have briefed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I brief?
must you brief?
must he brief?
must we brief?
must you brief?
must they brief?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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