English verb conjugation
OUGHT TO UNDERPIN

Regular verb: underpin - underpinned - underpinned

Affirmation

Simple form	V-ing form
I ought to underpin you ought to underpin he ought to underpin we ought to underpin you ought to underpin they ought to underpin	I ought to be underpinning you ought to be underpinning he ought to be underpinning we ought to be underpinning you ought to be underpinning they ought to be underpinning
Perfect	V-ing perfect
I ought to have underpinned you ought to have underpinned he ought to have underpinned we ought to have underpinned you ought to have underpinned they ought to have underpinned	I ought to have been underpinning you ought to have been underpinning he ought to have been underpinning we ought to have been underpinning you ought to have been underpinning they ought to have been underpinning

Negation

Simple form	V-ing form
I ought not to underpin you ought not to underpin he ought not to underpin we ought not to underpin you ought not to underpin they ought not to underpin	I ought not to underpinning you ought not to underpinning he ought not to underpinning we ought not to underpinning you ought not to underpinning they ought not to underpinning
Perfect	V-ing perfect
I ought not to have underpinned you ought not to have underpinned he ought not to have underpinned we ought not to have underpinned you ought not to have underpinned they ought not to have underpinned	I ought not to have been underpinning you ought not to have been underpinning he ought not to have been underpinning we ought not to have been underpinning you ought not to have been underpinning they ought not to have been underpinning

Interrogative form

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

Interro-negative form

Simple form	V-ing form
ought I not to underpin? ought you not to underpin? ought he not to underpin? ought we not to underpin? ought you not to underpin? ought they not to underpin?	ought I not to be underpinning? ought you not to be underpinning? ought he not to be underpinning? ought we not to be underpinning? ought you not to be underpinning? ought they not to be underpinning?
Perfect	V-ing perfect
ought I not to have underpinned? ought you not to have underpinned? ought he not to have underpinned? ought we not to have underpinned? ought you not to have underpinned? ought they not to have underpinned?	ought I not to have been underpinning? ought you not to have been underpinning? ought he not to have been underpinning? ought we not to have been underpinning? ought you not to have been underpinning? ought they not to have been underpinning?