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 must not brief
you must not brief
he must not brief
we must not brief
you must not brief
they must not brief

V-ing form

I must not be briefing
you must not be briefing
he must not be briefing
we must not be briefing
you must not be briefing
they must not be briefing

Perfect

I must not have briefed
you must not have briefed
he must not have briefed
we must not have briefed
you must not have briefed
they must not have briefed

V-ing perfect

I must not have been briefing
you must not have been briefing
he must not have been briefing
we must not have been briefing
you must not have been briefing
they must not 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

must I not brief?
must you not brief?
must he not brief?
must we not brief?
must you not brief?
must they not brief?

V-ing form

must I not be briefing?
must you not be briefing?
must he not be briefing?
must we not be briefing?
must you not be briefing?
must they not be briefing?

Perfect

must I not have briefed?
must you not have briefed?
must he not have briefed?
must we not have briefed?
must you not have briefed?
must they not have briefed?

V-ing perfect

must I not have been briefing?
must you not have been briefing?
must he not have been briefing?
must we not have been briefing?
must you not have been briefing?
must they not have been briefing?

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