English verb conjugation COULD BRIEF

Regular verb: brief - briefed - briefed

Affirmation

Simple form

I could brief
you could brief
he could brief
we could brief
you could brief
they could brief

V-ing form

I could be briefing
you could be briefing
he could be briefing
we could be briefing
you could be briefing
they could be briefing

Perfect

I could have briefed
you could have briefed
he could have briefed
we could have briefed
you could have briefed
they could have briefed

V-ing perfect

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

Negation

Simple form

I could not brief
you could not brief
he could not brief
we could not brief
you could not brief
they could not brief

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I brief?
could you brief?
could he brief?
could we brief?
could you brief?
could they brief?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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