English verb conjugation COULD UNDERPIN

Regular verb: underpin - underpinned - underpinned

Affirmation

Simple form

I could underpin
you could underpin
she could underpin
we could underpin
you could underpin
they could underpin

V-ing form

I could be underpinning
you could be underpinning
she could be underpinning
we could be underpinning
you could be underpinning
they could be underpinning

Perfect

I could have underpinned
you could have underpinned
she could have underpinned
we could have underpinned
you could have underpinned
they could have underpinned

V-ing perfect

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

Negation

Simple form

I couldn't underpin
you couldn't underpin
she couldn't underpin
we couldn't underpin
you couldn't underpin
they couldn't underpin

V-ing form

I couldn't be underpinning
you couldn't be underpinning
she couldn't be underpinning
we couldn't be underpinning
you couldn't be underpinning
they couldn't be underpinning

Perfect

I couldn't have underpinned
you couldn't have underpinned
she couldn't have underpinned
we couldn't have underpinned
you couldn't have underpinned
they couldn't have underpinned

V-ing perfect

I couldn't have been underpinning
you couldn't have been underpinning
she couldn't have been underpinning
we couldn't have been underpinning
you couldn't have been underpinning
they couldn't have been underpinning

Interrogative form

Simple form

could I underpin?
could you underpin?
could she underpin?
could we underpin?
could you underpin?
could they underpin?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

couldn't I underpin?
couldn't you underpin?
couldn't she underpin?
couldn't we underpin?
couldn't you underpin?
couldn't they underpin?

V-ing form

couldn't I be underpinning?
couldn't you be underpinning?
couldn't she be underpinning?
couldn't we be underpinning?
couldn't you be underpinning?
couldn't they be underpinning?

Perfect

couldn't I have underpinned?
couldn't you have underpinned?
couldn't she have underpinned?
couldn't we have underpinned?
couldn't you have underpinned?
couldn't they have underpinned?

V-ing perfect

couldn't I have been underpinning?
couldn't you have been underpinning?
couldn't she have been underpinning?
couldn't we have been underpinning?
couldn't you have been underpinning?
couldn't they have been underpinning?

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