English verb conjugation MUST UNDERPIN

Regular verb: underpin - underpinned - underpinned

Affirmation

Simple form

I must underpin
you must underpin
she must underpin
we must underpin
you must underpin
they must underpin

V-ing form

I must be underpinning
you must be underpinning
she must be underpinning
we must be underpinning
you must be underpinning
they must be underpinning

Perfect

I must have underpinned
you must have underpinned
she must have underpinned
we must have underpinned
you must have underpinned
they must have underpinned

V-ing perfect

I must have been underpinning
you must have been underpinning
she must have been underpinning
we must have been underpinning
you must have been underpinning
they must have been underpinning

Negation

Simple form

I must not underpin
you must not underpin
she must not underpin
we must not underpin
you must not underpin
they must not underpin

V-ing form

I must not be underpinning
you must not be underpinning
she must not be underpinning
we must not be underpinning
you must not be underpinning
they must not be underpinning

Perfect

I must not have underpinned
you must not have underpinned
she must not have underpinned
we must not have underpinned
you must not have underpinned
they must not have underpinned

V-ing perfect

I must not have been underpinning
you must not have been underpinning
she must not have been underpinning
we must not have been underpinning
you must not have been underpinning
they must not have been underpinning

Interrogative form

Simple form

must I underpin?
must you underpin?
must she underpin?
must we underpin?
must you underpin?
must they underpin?

V-ing form

must I be underpinning?
must you be underpinning?
must she be underpinning?
must we be underpinning?
must you be underpinning?
must they be underpinning?

Perfect

must I have underpinned?
must you have underpinned?
must she have underpinned?
must we have underpinned?
must you have underpinned?
must they have underpinned?

V-ing perfect

must I have been underpinning?
must you have been underpinning?
must she have been underpinning?
must we have been underpinning?
must you have been underpinning?
must they have been underpinning?

Interro-negative form

Simple form

must I not underpin?
must you not underpin?
must she not underpin?
must we not underpin?
must you not underpin?
must they not underpin?

V-ing form

must I not be underpinning?
must you not be underpinning?
must she not be underpinning?
must we not be underpinning?
must you not be underpinning?
must they not be underpinning?

Perfect

must I not have underpinned?
must you not have underpinned?
must she not have underpinned?
must we not have underpinned?
must you not have underpinned?
must they not have underpinned?

V-ing perfect

must I not have been underpinning?
must you not have been underpinning?
must she not have been underpinning?
must we not have been underpinning?
must you not have been underpinning?
must they not have been underpinning?

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