English verb conjugation
COULD UNDERDRESS

Regular verb: underdress - underdressed - underdressed

Affirmation

Simple form	V-ing form
I could underdress you could underdress he could underdress we could underdress you could underdress they could underdress	I could be underdressing you could be underdressing he could be underdressing we could be underdressing you could be underdressing they could be underdressing
Perfect	V-ing perfect
I could have underdressed you could have underdressed he could have underdressed we could have underdressed you could have underdressed they could have underdressed	I could have been underdressing you could have been underdressing he could have been underdressing we could have been underdressing you could have been underdressing they could have been underdressing

Negation

Simple form	V-ing form
I could not underdress you could not underdress he could not underdress we could not underdress you could not underdress they could not underdress	I could not be underdressing you could not be underdressing he could not be underdressing we could not be underdressing you could not be underdressing they could not be underdressing
Perfect	V-ing perfect
I could not have underdressed you could not have underdressed he could not have underdressed we could not have underdressed you could not have underdressed they could not have underdressed	I could not have been underdressing you could not have been underdressing he could not have been underdressing we could not have been underdressing you could not have been underdressing they could not have been underdressing

Interrogative form

Simple form	V-ing form
could I underdress? could you underdress? could he underdress? could we underdress? could you underdress? could they underdress?	could I be underdressing? could you be underdressing? could he be underdressing? could we be underdressing? could you be underdressing? could they be underdressing?
Perfect	V-ing perfect
could I have underdressed? could you have underdressed? could he have underdressed? could we have underdressed? could you have underdressed? could they have underdressed?	could I have been underdressing? could you have been underdressing? could he have been underdressing? could we have been underdressing? could you have been underdressing? could they have been underdressing?

Interro-negative form

Simple form	V-ing form
could I not underdress? could you not underdress? could he not underdress? could we not underdress? could you not underdress? could they not underdress?	could I not be underdressing? could you not be underdressing? could he not be underdressing? could we not be underdressing? could you not be underdressing? could they not be underdressing?
Perfect	V-ing perfect
could I not have underdressed? could you not have underdressed? could he not have underdressed? could we not have underdressed? could you not have underdressed? could they not have underdressed?	could I not have been underdressing? could you not have been underdressing? could he not have been underdressing? could we not have been underdressing? could you not have been underdressing? could they not have been underdressing?