English verb conjugation
SHALL UNDERPIN

Regular verb: underpin - underpinned - underpinned

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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