will underpin
Regular verb: underpin - underpinned- underpinned

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I will not underpin
you will not underpin
she will not underpin
we will not underpin
you will not underpin
they will not underpin 	I will not be underpinning
you will not be underpinning
she will not be underpinning
we will not be underpinning
you will not be underpinning
they will not be underpinning	I will not have underpinned
you will not have underpinned
she will not have underpinned
we will not have underpinned
you will not have underpinned
they will not have underpinned	I will not have been underpinning
you will not have been underpinning
she will not have been underpinning
we will not have been underpinning
you will not have been underpinning
they will not 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 	
will I not underpin?
will you not underpin?
will she not underpin?
will we not underpin?
will you not underpin?
will they not underpin? 	will I not be underpinning?
will you not be underpinning?
will she not be underpinning?
will we not be underpinning?
will you not be underpinning?
will they not be underpinning? 	will I not have underpinned?
will you not have underpinned?
will she not have underpinned?
will we not have underpinned?
will you not have underpinned?
will they not have underpinned? 	will I not have been underpinning?
will you not have been underpinning?
will she not have been underpinning?
will we not have been underpinning?
will you not have been underpinning?
will they not have been underpinning?