will underpin
Regular verb: underpin - underpinned- underpinned

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