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 she 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 she 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 she 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 she 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 oughtn't to underpin you oughtn't to underpin she oughtn't to underpin we oughtn't to underpin you oughtn't to underpin they oughtn't to underpin	I oughtn't to be underpinning you oughtn't to be underpinning she oughtn't to be underpinning we oughtn't to be underpinning you oughtn't to be underpinning they oughtn't to be underpinning
Perfect	V-ing perfect
I oughtn't to have underpinned you oughtn't to have underpinned she oughtn't to have underpinned we oughtn't to have underpinned you oughtn't to have underpinned they oughtn't to have underpinned	I oughtn't to have been underpinning you oughtn't to have been underpinning she oughtn't to have been underpinning we oughtn't to have been underpinning you oughtn't to have been underpinning they oughtn't to have been underpinning

Interrogative form

Simple form	V-ing form
ought to I underpin? ought to you underpin? ought to she 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 she 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 she 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 she 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
oughtn't I to underpin? oughtn't you to underpin? oughtn't she to underpin? oughtn't we to underpin? oughtn't you to underpin? oughtn't they to underpin?	oughtn't I to be underpinning? oughtn't you to be underpinning? oughtn't she to be underpinning? oughtn't we to be underpinning? oughtn't you to be underpinning? oughtn't they to be underpinning?
Perfect	V-ing perfect
oughtn't I to have underpinned? oughtn't you to have underpinned? oughtn't she to have underpinned? oughtn't we to have underpinned? oughtn't you to have underpinned? oughtn't they to have underpinned?	oughtn't I to have been underpinning? oughtn't you to have been underpinning? oughtn't she to have been underpinning? oughtn't we to have been underpinning? oughtn't you to have been underpinning? oughtn't they to have been underpinning?