English verb conjugation
WOULD UNDERPIN

Regular verb: underpin - underpinned - underpinned

Affirmation

Simple form	V-ing form
I'd underpin you'd underpin she'd underpin we'd underpin you'd underpin they'd underpin	I'd be underpinning you'd be underpinning she'd be underpinning we'd be underpinning you'd be underpinning they'd be underpinning
Perfect	V-ing perfect
I would've underpinned you would've underpinned she would've underpinned we would've underpinned you would've underpinned they would've underpinned	I would've been underpinning you would've been underpinning she would've been underpinning we would've been underpinning you would've been underpinning they would've been underpinning

Negation

Simple form	V-ing form
I wouldn't underpin you wouldn't underpin she wouldn't underpin we wouldn't underpin you wouldn't underpin they wouldn't underpin	I wouldn't be underpinning you wouldn't be underpinning she wouldn't be underpinning we wouldn't be underpinning you wouldn't be underpinning they wouldn't be underpinning
Perfect	V-ing perfect
I wouldn't have underpinned you wouldn't have underpinned she wouldn't have underpinned we wouldn't have underpinned you wouldn't have underpinned they wouldn't have underpinned	I wouldn't have been underpinning you wouldn't have been underpinning she wouldn't have been underpinning we wouldn't have been underpinning you wouldn't have been underpinning they wouldn't have been underpinning

Interrogative form

Simple form	V-ing form
would I underpin? would you underpin? would she underpin? would we underpin? would you underpin? would they underpin?	would I be underpinning? would you be underpinning? would she be underpinning? would we be underpinning? would you be underpinning? would they be underpinning?
Perfect	V-ing perfect
would I have underpinned? would you have underpinned? would she have underpinned? would we have underpinned? would you have underpinned? would they have underpinned?	would I have been underpinning? would you have been underpinning? would she have been underpinning? would we have been underpinning? would you have been underpinning? would they have been underpinning?

Interro-negative form

Simple form	V-ing form
wouldn't I underpin? wouldn't you underpin? wouldn't she underpin? wouldn't we underpin? wouldn't you underpin? wouldn't they underpin?	wouldn't I be underpinning? wouldn't you be underpinning? wouldn't she be underpinning? wouldn't we be underpinning? wouldn't you be underpinning? wouldn't they be underpinning?
Perfect	V-ing perfect
wouldn't I have underpinned? wouldn't you have underpinned? wouldn't she have underpinned? wouldn't we have underpinned? wouldn't you have underpinned? wouldn't they have underpinned?	wouldn't I have been underpinning? wouldn't you have been underpinning? wouldn't she have been underpinning? wouldn't we have been underpinning? wouldn't you have been underpinning? wouldn't they have been underpinning?