to underpin
Regular verb: underpin - underpinned- underpinned

Indicative 	
Present 	Present continuous 	Preterite 	Preterite continuous 	
I underpin
you underpin
he underpins
we underpin
you underpin
they underpin 	I'munderpinning
you'reunderpinning
he'sunderpinning
we'reunderpinning
you'reunderpinning
they'reunderpinning	I underpinned
you underpinned
he underpinned
we underpinned
you underpinned
they underpinned	Iwasunderpinning
youwereunderpinning
hewasunderpinning
wewereunderpinning
youwereunderpinning
theywereunderpinning	
Present perfect 	Present perfect continuous 	Pluperfect 	Pluperfect continuous 	
I've underpinned
you've underpinned
he's underpinned
we've underpinned
you've underpinned
they've underpinned	I'vebeen underpinning
you'vebeen underpinning
he'sbeen underpinning
we'vebeen underpinning
you'vebeen underpinning
they'vebeen underpinning	I'd underpinned
you'd underpinned
he'd underpinned
we'd underpinned
you'd underpinned
they'd underpinned	I'd been underpinning
you'd been underpinning
he'd been underpinning
we'd been underpinning
you'd been underpinning
they'd been underpinning	
Future 	Future continuous 	Future perfect 	Future perfect continuous 	
I'll underpin
you'll underpin
he'll underpin
we'll underpin
you'll underpin
they'll underpin 	I'll be underpinning
you'll be underpinning
he'll be underpinning
we'll be underpinning
you'll be underpinning
they'll be underpinning	I'll have underpinned
you'll have underpinned
he'll have underpinned
we'll have underpinned
you'll have underpinned
they'll have underpinned	I'll have been underpinning
you'll have been underpinning
he'll have been underpinning
we'll have been underpinning
you'll have been underpinning
they'll have been underpinning	

Conditional 	
Present 	Present continuous 	Past 	Past continuous 	
I'd underpin
you'd underpin
he'd underpin
we'd underpin
you'd underpin
they'd underpin 	I'd be underpinning
you'd be underpinning
he'd be underpinning
we'd be underpinning
you'd be underpinning
they'd be underpinning	I'd have underpinned
you'd have underpinned
he'd have underpinned
we'd have underpinned
you'd have underpinned
they'd have underpinned	I'd have been underpinning
you'd have been underpinning
he'd have been underpinning
we'd have been underpinning
you'd have been underpinning
they'd have been underpinning	

Infinitive 	
Imperative 	
Infinitive 	 	Imperative 	 	
to underpin 	 	underpin
Let's underpin
underpin 	 	

Participle 	
Present 	Past 	 	 	
underpinning	underpinned