English verb conjugation
MAY UNDERPIN

Regular verb: underpin - underpinned - underpinned

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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