will underpin
Regular verb: underpin - underpinned- underpinned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I won't underpin
you won't underpin
he won't underpin
we won't underpin
you won't underpin
they won't underpin 	I won't be underpinning
you won't be underpinning
he won't be underpinning
we won't be underpinning
you won't be underpinning
they won't be underpinning	I won't have underpinned
you won't have underpinned
he won't have underpinned
we won't have underpinned
you won't have underpinned
they won't have underpinned	I won't have been underpinning
you won't have been underpinning
he won't have been underpinning
we won't have been underpinning
you won't have been underpinning
they won't have been underpinning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
will I underpin?
will you underpin?
will he underpin?
will we underpin?
will you underpin?
will they underpin? 	will I be underpinning?
will you be underpinning?
will he be underpinning?
will we be underpinning?
will you be underpinning?
will they be underpinning? 	will I have underpinned?
will you have underpinned?
will he have underpinned?
will we have underpinned?
will you have underpinned?
will they have underpinned? 	will I have been underpinning?
will you have been underpinning?
will he have been underpinning?
will we have been underpinning?
will you have been underpinning?
will they have been underpinning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
won't I underpin?
won't you underpin?
won't he underpin?
won't we underpin?
won't you underpin?
won't they underpin? 	won't I be underpinning?
won't you be underpinning?
won't he be underpinning?
won't we be underpinning?
won't you be underpinning?
won't they be underpinning? 	won't I have underpinned?
won't you have underpinned?
won't he have underpinned?
won't we have underpinned?
won't you have underpinned?
won't they have underpinned? 	won't I have been underpinning?
won't you have been underpinning?
won't he have been underpinning?
won't we have been underpinning?
won't you have been underpinning?
won't they have been underpinning?